a really big one, he could've literally killed him. (/TДT)/ PotatoYaoi<3
I think if he was going to kill him, Yukio would have no trouble hitting his mark. But he needed the Illuminati to believe he was on-board with them. BUt I agree, he needs to say I'm sorry when this is over :)
but he still owes Ren a big 'i am sorry'