User blog comment:Xilinoc/Ch. 576 - THE KILLERS HIGH 2/@comment-31283382-20140410044535/@comment-2211792-20140410170828

Technically, Guenael caused his own death, because he vanished from Gremmy's memory, and Gremmy couldn't imagine him anymore. And can you really blame him for trying to kill enemy soldiers? He's the first Quincy who actually scored a kill since this invasion started, so at least he takes his job seriously... though he's certainly better at assassination than actual fighting.

Gremmy's flaw is that he doesn't use his power as effectively as he could. If his power was restricted to creating stuff, then I'd buy it, but he can transmute existing stuff, too...