Old man Genjuro stops Tsubasa's BFS before it hits Hibiki. He's just Badass enough to not needing a Relic to stop a Relic user. Rumor is that he is skilled in "a special kind of martial arts". Said martial arts might beAnsatsuken.
Genjuro continues to be awesome in Episode 8, where he saved Chris from Noise attacks by using his own feet to stomp the ground and create walls to protect both of them... which is followed by jumping with Chris to the top of a building.
Episode 11 is another Genjuro awesome, owning Phine in combat until she's forced to use Ryoko's voice to distract him and stab him on the chest... which he survived.
While he whoops on her, Phine demands to know how a regular guy can take on a Gear user. G-Man's response?
Genjuro: "I eat, watch movies and sleep. A True Man knows nothing else!"
He manages to damage Phine's Nehushtan armor even when his punch missed. That's right, his punch had so much force he didn't even need a direct hit to cause damage. How doesn't it hurt him? Because of the above quote, that's why!
Episode 13. All the girls use the fully-powered up version of their weapons: Ame no Habakiri grows to the length of a skyscraper, Hibiki's gauntlets get their "charge-lines".... that extend for several hundred meters, and Ichii-bal's Mega Deth Quartet gains a battleship's worth of cruise missiles.
The reasons their weapons gain this awesome supercharge? To destroy a chunk of the FUCKING MOON!
The grand return of Hibiki and Chris. Highlights include Chris's GigaZeppelin, and Hibiki using a train car as a slow down tool, so she can Megaton Punch the Noise in the tunnel.
Tsubasa VS Maria in episode 2. Special mention goes to Tsubasa wicked awesome spinning sword of fire.
Hibiki and Chris dropping in to assist her, and turning the arena into a 3 VS 3 Gear user fight.
The combination Swan Song. Which ends in a rainbow colored punch of awesomeness, that sends the Replicator Noise into the atmosphere.
Tsubasa getting a little jumping boost from the 2nd Division's new submarine base in episode 3.
Ogawa whooping the(over the phone) asses of a group of thugs. And never breaking conversation with Genjuro.
Hibiki VS the Nephilim in episode 5. Until it bites her arm off anyway...
Ver thinks he has Chris cornered with a Power Nullifier, Anti-linker gas, preventing her from retaliating against an army of Noise, and is about to pull a You Have Outlived Your Usefulness on her. "Thinks" is the keyword : What does she do? She promptly goes around the Anti-linker problem by blowing up her gear into butt-nakedness, and a rain of shards, taking down half of the Noise in the process and scaring the living shit out of Ver who promptly goes Oh, Crap!.
Hibiki gets her very own upon grabbing Maria's Armed Gear as it was about to kill Ver, and pulling her Transformation Sequence when she should for all intents and purposes be unable to as she was Brought Down to Normal, prompting an Ironic Echo to Fine in last season's episode 12 as Maria asks "What is it? WHAT ARE YOU?", prompting another Big YES as she answers "PIERCING, GUNGNIR DA !".
All of the above combined should qualify for a Big YES on their own.
For some, the fact that Maria would no longer stand with Ver's bullshit any longer, even if Hibiki 'stops' her, deserve a crowner here too.
Episode 13. All of it. But especially the final attack of the season: VITALIZATION!
Everyone has their own awesome moment. But Miku takes the cake for using that track training to run out and hurl Solomon's Cane straight through the rip in space several meters in the air closing it and saving the world from an exploding Nephilim.