It should be noted that Killy was stabbed through the chest with one of Schiff's blades. What does he do before punching him to death? He grabs the blade and flips Schiff over his body.
finishing off gigantic mecha Eldritch Abomination with fucking same, if not more powerful, Gravitational Beam Emitter for its mouth, in what's easily the most Badass thing done in the series. How he does that? He connects his body to all the dead Silicon Creatures (which of course, he killed them himself), drawing all their energy WHILE the beast charges its coup de grace, then BAM!
Seu's fight with the Silicon Life soldier Maeve. Before the fight even begins properly, he loses his left arm and as the fight goes on, his blade is cut down to the hilt and he has his chest rent open. What does he do? Stab Maeve through the head with the blunt sword. Then follows it up by throwing the hilt of his sword at a Safeguard that is attacking his master, Mensab and goes through its eye with the hilt. This is a normal, albeit Bad Ass man, facing power armour clad cyborgs and winning with an incredibly sharp sword.
While we're talking awesome, how about the awesome music and sound design of the short animated series? In a show where there's little-to-no dialogue, the sound can make or break the mood and it totally nails the mood.
In the same vein, there are 2 CGI animated shorts, let's just say that they're badass