I admit to taking satisfaction when I saw a similar clip. In this case two 'chavs' were standing on a path while a third was filming from a distance. The two pretended to chat as a young couple approached and as they passed, one swung round and punched the girl in the face. Unbeknown to them the boyfriend was quite a tasty local boxer who then proceeded to give them both a bloody good pasting.
Sorry, but i cheered him on.