Reason why I hate parks AGAIN..........

So I took Justin to the park with his older cousin. They were jumping on a little bridge and a little girl came running and tripped on the bridge. She started balling and ran to her mom. We were about to leave and the mother told me she would like to talk to me.....(I am thinking in my head oh boy here we go again that my son did something wrong to her child.) Her little girl said...yep I think that is the one. I thought she would tell me that my son pushed her on the bridge...I was wrong...she told me she thinks my son told her daughter to pull up her dress and pull down her panties. It blew me for a loop. I told her my son is a little to young and that is not even in his vocabulary. I told her I have been watching him the whole time and he has not even played by her daughter except on the bridge where she tripped. I told her I saw an older kid that was wearing an orange shirt and could have asked her. She finally calmed down and the little girl couldn't remember if it was my son or not. Yikes....I feel like I attract trouble:-)What would you have done in that situation???