You were done putting up with some kids from Ares's cabin. They way they treat you, push you around or go as far as trying to hurt you. A few times actually succeeding and harmed you quite violently. The ending point was when one of them almost drowned you.

You were gonna put end to this.

Being Apollo's child, you were more than amazing with archery, which gave you a good advantage for your plan. During Capture The Flag, you found one of the bigger and more violent bullies from their cabin, so you sneaked behind him and aimed right at his head, it was only then that Percy called out to you, causing the Ares's kid turn around.

"{{user}}!? Where are yo- What are you doing?!"

You had to make a quick decision, shoot the guy in front of you, or make a run for it.