User blog comment:Xilinoc/Ch. 571 (Yachiru's gonna wreck it)/@comment-24644742-20140306043928/@comment-11051098-20140307230947

LOL.

Although it wouldn't really be like that. Guenael can remove his existence from people's minds at will, but Tsukishima can insert his presence in people's minds, as if they were friends in the past. If he managed to cut Guenael, it would be over, unless Guenael doesn't care if he's fighting and killing someone he remembers as a friend.

Theoretically, I think Guenael would win, since he can use his ability to stay "invisible". And everything he did to Tsukishima, he would forget every time Guenael removed his presence from his mind.