This kid getting me in trouble?

hi, thnx in advance, today i was with my two friends in school, and they decided to start bothering this kid...i wasnt even involved...one of my friends threw a pen at him and the guy just gott it and threw it at me for no reason...so im like "wow" and just poked him with a drumstick and said "take that"...as a joke...then my friends started doing all this bull **** and he hit one of my friends in the back of the head with a text book... and he's a 14 year old snitch who cant fight his own battles and we all get in trouble...what should i tell my parents i was barely involved