User blog comment:SayuriDarling/The Mark of Athena Official Discussion/@comment-4737110-20121015073040/@comment-3146930-20121016172316

With the Jason/Percy fight, it is hard to say that Percy definitively won, as there are a lot of factors. For example, right before they clash for the first time, Piper uses her charmspeak and Jason momentarily hesitates, giving Percy enough time to hit him (with the flat of his blade of course). Then, when Piper tries the same thing on Percy, Jason uses that moment to blast him with lightning. Jason the rushed to finish him off, but Piper stopped him, leading to Percy sweeping Jason's leg out from under him and knocking him out.

In every case where the two would have actually fought, Piper causes one of them to hesitate, leading to someone getting the upper hand. Now that I mention it, if Piper had done nothing, the two could have fought until they were both tired, lol