User blog comment:SayuriDarling/Full first chapter of The Mark of Athena/@comment-94.168.77.157-20120630180333/@comment-3146930-20120630181537

You don't need to scream in battle if you don't want to. Normally people would scream when charging at an enemy to kind of scare them, but once you engage in battle, screaming just tires you out as oxygen is being used to scream, instead of being used to keep your body going.