First of all, welcome to the forum. As you know this is a MMA forum and street fighting is never a good topic. The funny thing is we never get anyone in here that says they lose, weird huh. So how old are you if 17 is out of your age range. It sounds to me like you have a LOT of growing up to do. I thought you were a lot older because I thought you were talking about fighting in a tournament. You were talking about how you fought someone in your age group and someone in the "audience" blah blah blah. Let me guess, your 12 right. I'm not trying to be a jerk, but we've had a lot of younger members come on here that never seem to work out. I hope you are the exception. Who are your favorite MMA fighters, who do you see winning some upcoming matches. Lets get to know ya a little better.
As for your question, yeah, walk away unless you get attacked first. I'm still trying to figure out how the fight stopped anyways because of a hand injury. Last time I checked high school fights normally didn't end till someone didn't want to get back up or someone was pulled away.