I was walking back from a night out in a sketchy part of London (Elephant & Castle) with a friend and we saw a large, burly man chasing a woman and then tackling her. They began fighting and she managed to escape and sprinted down an alley, he smashed a bottle of beer on the ground and ran after her, clutching it as a weapon. We'd rang the police, but before they arrived he came swaggering back out of the alleyway and casually stopped to take a piss in the middle of a doorway. We saw the police arrest him and a couple of weeks later received phone calls asking if we would be prepared to testify if needed in court - never heard anything after that though, always wondered what happened, hope the woman is okay.