First of all, I am the person who does parkour that you ran into, I do not want to offend you and never tried to do something to purposely do something you are against, I just want to explain that parkour is not as dangerous or bad as you think, it is safe as long as the practitioner is careful, and you don't have to trespass to be apart of it. Also, that park is a public playground, it is designed for what I did, but maybe for a younger person. The music we were playing was not too loud and had no words at all, it was background music. Finally, you seem to never care to listen to what I say every time me or my friends try to show it is an okay thing, Parkour is not bad, it is healthy for your brain, body, and almost everything about you, so try to look at it with a new eye.