Youths attack a band in the street

A street singer plays quietly in an English street while being filmed. A few young people pass by, touch his equipment, then notice that they are in the video. One of them asks them to stop, even though they're on the public highway. The argument quickly escalates. Without much warning, one of the youngsters slaps the singer across the face. The incident is captured on video. No information is given on what happened next or whether the authorities intervened, but the atmosphere clearly changed in a matter of seconds.