I think it should kill him, but also recharge faster. Since there is increased risk with speed of decay then there should be increased reward with speed of becoming enraged.
I mean, he has to be in melee range to kill stuff in the form, so it makes it useless on objectives anyway. I kind of want to use it as an assassination tool, turn, hit an elite, turn back, collect aleph, take a shot, turn do it again. etc. See if it works/is worth it.