User blog comment:Menara/The Son of Sobek: The official PJ and Kane Chronicles Crossover/@comment-4430596-20130203003349/@comment-5774152-20130203222230

Well i'm sure the fist would maybe knock Percy down at least, but not seriously hurt him since he still would have the curse of Achilles. Carter proabably would be surprised and think he's working some kind of protection spell or something. Carter could maybe assume he's not from any of the North American Nomes and assume he's from another Nome somewhere else in the world. Percy is shown to think Carter is a Half-Blood.

But if Percy started using his water abilities, maybe Carter would think he followed the path of...of the Egyptian god of rivers (can't think of his name at the moment), when Percy doesn't think of himself as magic. But to Percy, Carter would be using magic and think he is a son of Hecate or something. They proabably would be able to defend themselves against each others magic/powers though. It would be kinda weird if they couldn't. I know, I sound a little confusing but i'm just thinking of what both of them think, and the reason why it hasn't come up before in the Heroes of Olympus series while we were in Percy's POV, or Carter's, if this story takes place before The Serpents Shadow.