Well, I'm almost inclined to think this calls for a time out. I admit it's possible Kay is doing this deliberately somehow, but he hasn't so far demonstrated any supernatural abilities. If this is somehow related to the sword or even Rinnosuke's curse, however, he may have no clue what's going on or that we're feeling seriously injured now, despite not being visibly injured. Either way, I feel like this changes things and it might be a good idea to actually stop and ask him whether he's doing this and/or why. It's not like we can't stay out of range while doing so, if it comes to that.