When does IH's "obliteration" trigger and how is it like?

KillMasterC

His sig reads like "he has a chance to instant KO the enemy with any of his specials", that's too cool ... but I've never seen it.
I myself don't have a duped IH (I get a 2* IH just yesterday and he is the last 2* I can get) so I can't experience it. Sometimes, enemy IH shouts "I will tear you apart" but I'm never KO'ed instantly. So ... what is it like to be obliterated?

Mustangjon

He does about double dmg when he says that and it triggers

MaxBebop

It's crit hit based dmg, it's 50% activation, and at lvl 100 sig it does +600% crit damage from the special it's used on.

KillMasterC

OK, so it's just a buff for playing a word like that.