I don't even know what's the right option. But Zangetsu is our sword-friend, and we're not going to take him down just so we can survive. He is us, that'd be like stabbing ourselves in the face so that we can keep our face. Except stabbing ourselves in the face to keep our face makes more sense. Or maybe less, I don't know.
[X] Refuse violenty
So, was it Ichigo's sudden surge of power that knocked everyone out?