Originally Posted by
Mikeyrocks
1) His health goes to full and increases by 40% of his total HP. So this means it would be wise to down the heart at it's first spawn (75%).
2) If you were to kill the heart at 25%, he would go back to full + have 40% of his HP, as stated before. You cannot kill him in the heart phase, the damage from the heart phase is transfered after he comes back up.
3) Not sure about this, since I have yet to do it on hard mode, but I would say it would eventually despawn; it would just make it so that whoever has the bomb needs to move immediately, or that the boss will need to be kited in order to compensate for the group avoiding it.
4) I don't know, but I doubt it. It has something to do that he's like a little child (hence the voice, tantrum, "I don't think it bends that way" [he thinks we're toys], etc.).