So I did the thing:
Hope you guys can enjoy this.
yes, actually it works on all characters. we even use level 80 gears vs OP 10 Hyperius.
we also did antagonist kill on the dragons with maya and axton on OP0. and I believe krieg can also do the same (with a lot of luck).
huh, neat! I always thought using incinerators own strength against him to be ironically funny xD
I feel krieg is the most dangerous to pull off, because he has no defense against the reflected bullet after the boss dies. I believe this kill was 1/3 second.