So just yesterday my school friends and I were playing ping pong at the ping pong tables in the school yard, the bell rings, we have Art class which is 3 minutes away. My two friends and I are going back to the school building while playing the ball to each other and trying to make it stay in the air as long as possible when suddenly a swaggot from the year below turns up and steals the ball and runs off, I chase him with a friend and demand him to return it, he doesn't, he shoots it away, I give him the evil eye, he shoves me , I shove him, his friends get involved one of them fights my friend while the other one kicks me, resulting in me catching his foot in the air and pulling it thus making him fall and cry, I get the ball, return to class just in time.
He tells the principal and there's a high percentage I'll get suspension from the school trip I've waited over a year for.
How should I defend myself when they ask for my side? He'll exaggerate and presumably say I called him x y z. I really need your advise because I suck at defending myself especially in front of authorities since I tend to overthink and then blabber nonsense.