Board Thread:Off Topic/@comment-3965075-20150620202833/@comment-24891101-20150622013951

You know what? Sure. Let's allow it.

Let's allow it, with the proviso that the character can only ever use the ability once. So he uses it. Then he's a Grimm, with no agency, no soul, no identity, no individuality, no ability or inclination to turn back, and a raving bloodlust to kill anyone around him. This happens, and his corpse is killed.