I'm pretty sure I'm not the only one who has seen this happen: There's some devilites and pit bosses around; I bust out my snarby sword and start hacking away at them. I whittle down their numbers and just as I'm starting to take out the last of them, something odd happens...
I take some swipes at a devilite and a pit boss standing together. The devilite goes down first, and in the next swipe the pit boss goes down. BUT WAIT, that was the last regular devilite in the area, so the remaining pit bosses all transform into devilites... including the one in the middle of its death animation.
Devilites are annoying enough without self-resurrection powers.
This happened to me twice, like you said: "Devilites are annoying enough without self-resurrection powers."
This caused me to die in a tier 3 run on the one occasion that this happened, and this was my face: ლ(ಠ益ಠლ)