How do you deal with obnoxious teenagers that aren't yours?

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I need help with this badly. My daughter is a mentor in the Friday Night Live program at her school. Most of the proteges from the middle school are pretty decent and respectful. But there are 3 boys that are constantly rude, foul mouthed, and very disrespectful. I am not directly involved, myself, but I do interact with the kids when I pick my daughter up in the afternoons. The last time I showed up, these boys were outside with a football, and they were not being careful of the vehicles around. When the leader and my daughter told them to go inside, they mouthed off saying that they didn't have to listen to anyone. Here is where I come in...one of the boys made as if to throw the football at my car (as that's where my daughter and the leader were standing), but before it left the boy's hand, I was out of the car and telling him in a quiet tone that he better not throw the ball and to knock it off. All three boys proceded to cuss me out as well as my daughter, and continued back talking the leader who was doing the best she could to defuse the situation. I decided to get back in my car before I said something I would regret (since it was on school grounds). How would you have dealt with them, or a similar situation? Any suggestions would be appreciated. Thanks in advance.