I don't like how Kawamiri works at all, awful, unrealistic, over power, spammable. If I had to suggest a good way for it to work, I'd say check out Naruto Shippuden Ultimate Ninja Storm 3, a bar with kawamiri times you can use it, and if used, teleports you/dodges the attack and gets you somewhere not very far away from where you were, suddenly appearing behind your opponent if they attack you with a kunai is unrealistic, besides, its the worst possible, you already know where your opponent is gonna appear, if you have AoE attacks, if you have powerful projectile jutsus you can spam them until your opponent uses kawamiri, then use a powerful AoE one, dead player. Or simply use the AoE one, if he kawamiri he's getting hit still, with jutsus such as Shinra Tensei.