The only stupid thing about it is that Zenos and Fandaniel accomplished exactly nothing from doing it.
Didn't even manage to, say, break G'raha's arm or something.
Probably wasted enough mana that their Moon Plan failed. And they *knew* the souls would switch back in under an hour. Probably even if the WoL died.

... I guess I can forgive not just outright killing the WoL, when they had the chance. Fandango definitely should have, and seems to be in charge, but Zenos wouldn't have liked that very much...