A version of Colossus Climb controlled by the Rule of Cool. A character somehow jumps and runs along a rain of falling debris or projectiles — none of which are actually attached to anything — not only to dodge but to gain altitude, sometimes to reach the area firing the things in the first place. A very good way to not only show off a character's agility but also their speed.
A common variation of this seen in Platform Games is having to climb a waterfall by jumping on logs which are cascading down.
Technically due to Newton's Third Law of Motion this isn't actually impossible, it just requires that the rocks have enough mass to be worth pushing against, and that the character can run and jump faster than they are falling. It all becomes much more plausible if their destination is in freefall along with them.
Not to be confused with Floating Continents. See also Improvised Platform.
In InuYasha, the character Koga, whose speed and agility are enhanced by magical jewel shards in both his legs, demonstrates the ability to run up rockslides, even while carrying another character. The title character sometimes does so, too, though it usually takes the only slightly more plausible form of leaping from one large, plummeting boulder to another.
Jiyu and Freeshia from Jubei-chan spend a portion of their final title bout duking it out on top of a falling redwood which, for bonus points, they'd just sent flying in the first place.
Mahou Sensei Negima!; Ku-Fei found herself doing this when she accidentally shattered the rock spire she was standing on while training her martial arts in the Magic World. An inversion, since she did it to get down and away safely. Also a use of Flash Step, rather than superhuman leaping.
The last episode of Slayers Next has Gourry doing this. What's more remarkable is that by doing this he beats people who are simply flying their way out. The Power of Love is strong, indeed.
When Guy didn't get enough distance with a jump, he summoned Ningame for the first time in years (both in and out of story) in midair to give him something to get extra air off of.
In the Sengoku Basara 3 manga, Ishida Mitsunari takes this to the extreme by slashing a group of soldiers into the air with his sword and using them as stepping stones to reach a second floor balcony.
Ranma Saotome from Ranma ½ bounced around the falling debris of a collapsing mountain to save Herb after knocking him out in the first place. Much earlier, and arguably even less reasonably, he swam up the spray of a fire hose during his fight with Kodachi.
In A Certain Magical Index, to rescue Kuroko, Mikoto blows a hole in a building with her Railgun attack, then Touma runs and leaps along the flying debris from the attack to grab Kuroko. Kuroko was on the fourth floor.
The Flash can get away with this because he's not just quick, he's supersonic. Running up the side of a building is a standard Flash trick. But Barry Allen, the Silver Age Flash, didn't stop there; he took this trick (and so many others) to truly hilarious lengths. Barry would routinely run along things like smoke particles and — no joke — light beams.
In the Archie continuity of Sonic the Hedgehog, the Hedgehog hero once pulled it off using sand he got out of his shoes to go from falling off a cliff to running to safety.
Films — Animated
Tai Lung's prison break in Kung Fu Panda involved clawing his way out of a bottomless pit by leaping from bit to bit of the falling debris that would have crushed him. Po does it later in the film with some broken off roof tiles.
The end of the anime film Mind Game has the main characters escaping their prison in the stomach of a giant blue whale by running up the water pouring in when it surfaces. Then they run up planes, subway trains, boats, and a large amount of other things being swallowed by the whale with enough power to launch them far into the sky. Earlier the main character outruns God.
In Final Fantasy VII: Advent Children, Nanaki, Yuffie, Vincent, and Tifa leap into the air and throw Cloud further upwards. It happens again in the final showdown between Cloud and Sephiroth, where part of the fight literally takes place on, in, and through falling rubble from a destroyed building.
Beautifully parodied in the movie Kung Fu Hustle: during the final battle, in order to gain enough height to execute his Finishing Move, the hero uses a bird in flight as a stepping stone.
Done in Priest by the titular character. In this case, his stepping stones are rocks thrown horizontally by the Priestess.
Spider-Man 3: Spidey performs an inversion of this trope: he uses falling rubble to go down faster.
Luke, Mara, and Tahiri perform this during the New Jedi Order series, at a point where they're fighting a Dark Jedi with the language-less mentality of a five year old on a ruined Coruscant. Slightly easier for them as they had the help of the Force, as well as the fact that many of the rocks they were hopping across were building size.
In Irish myth it was said that Cú Chulainn could throw three spears at three targets, leap to the last spear thrown, from there to the second, then to the first, then to the ground to slay another opponent even as the spears hit their targets. Making this Older Than Feudalism.
Every Sonic the Hedgehog game ever. This ranges from logs in waterfalls to the much more regular falling stepping stones. Other objects include midair springboards to floating enemies that (usually) Sonic must homing attack across.
The intro movie in Sonic CD has a particularly badass example of Sonic jumping on falling rocks before Spin Dashing through a large boulder and hopping off it before it crumbles away.
One of the bosses in attacks Mario by throwing boulders at him, and the only way to get close enough to defeat him is to jump from boulder to boulder (in which the preceding levels have provided ample practice, but with less of the "In The Sky" factor).
Also many hacks do this with falling springboards, shells, P switches and keys. There's also actually a trick required in the hardest of them that actually requires Mario to continually jump upwards while pulling up the key he's standing on in mid air.
Not to mention whenever Bullet Bills appear in any 2-D Mario game—they're there as things for Mario to leap off of, especially in later stages when he needs the extra height to proceed.
Used in Skies of Arcadia when after Zelos was awakened, the whole lower structure of the Dangral Island complex attached to The Very Definitely Final Dungeon starts to collapse including the rail lift that took the Heroes there, so they had to run all the way up to the start of the rail lift while it was crumbling. At the end it resulted in a full body catch after the last of them got off at the start of the rail lift.
In Kingdom Hearts II, you can do this with fragments of buildings. That you cut into pieces yourself.
With the right Schticks, characters in the Feng Shui game can walk on hails of bullets. It's still damn hard, just not impossible.
In Super Smash Bros. Brawl, Wario is capable of doing this by pulling his bike out of Hammerspace when in midair then immediately jumping out of it, which still allows him access to his Double Jump. Doing this actually boosts him higher than his regular recovery move.
Asura in Asura's Wrath does this to jump above the second form of Wyzen and continue to attack from above when sky diving.
In Super Mario Galaxy, we have the staircase at the end of each Bowser level leading to the planet which Mario fights Bowser on, which gets smashed apart by meteorites summoned by Bowser (and in the case of the final boss battle, his son Bowser Jr.) as he does so.
In The Lion King, the "Hakuna Matata" level has a waterfall Simba has to climb by jumping on logs.
Disgaea 4 has a fist move called Master Palm in which the user causes Chunky Updraft to send boulders (and their target) into the sky, uses them as stepping stones to get up to a particularly large one, rapidly punches it into the shape of a hand, and then kicks the massive stone hand at their opponent, crushing him into another boulder.
Halo 4 gets in on the action when Master Chief jumps onto a Lich to get near a fleeing capital ship.
Ruby, Weiss, Blake, and Yang do this when the Nevermore smashes the temple they were in.
Pyrrha pulls a really ludicrous version in "Extracurricular", taking out her shield in midair and then kicking off it. (This is almost conceivable if she's using her semblance to hold the shield still, but she doesn't seem to be doing that — and it would be obvious to anyone watching, when as noted later, Pyrrha tries to keep her semblance a secret.)
In Teen Titans, using her name-implied superpowers, Terra performs a visual interpretation of the trope to get Badass Normal Robin into the face of a giant robot worm. Robin himself used this method several times over the course of the series.
Sort of used in an episode of Spongebob Squarepants, Spongebob and Sandy are chased by, and eventually end up riding, a huge Alaskan Bull Worm. It heads toward a cliff and after it begins to plunge off the side, they run back up the falling worm and end up safe and sound on the cliff's edge.
Ruel does this himself while running from a monster in the first episode of Season 2, although this is for Rule of Funny as anything else.
Agent Six's Establishing Character Moment in the first episode of Generator Rex is jumping out of a low-flying plane with a pair of katanas, toward falling debris that is about to land on a handful of squishy civilians. He proceeds to jump from piece to piece, slicing them apart as he goes, before landing on his feet while the rubble lands harmlessly around the civilians, and telling the faltering main character to get a move on. And he only gets more badass from there.