Ah I see. Well good to know lol and I'm headed off for now. Took my medicine and I can feel unconciousness on the back of my neck. I might return really early morning so we'll see. xdxdxdit's as you said, it appears to be a "warp" in which is focused on the incoming target, furthermore, the kunai is the epicenter of this warp, so since amaterasu will just appear on his body, he has no chance of stopping it that way.
Later peeps.