Random Attack

The OP I would guess is not native to the UK and therefore not used random pointless acts of violence because they only really occur in the UK believe it or not. In other countries people mug you.
I would also guess the OP did not react like a lot of people that have been born in a UK city when someone runs at you, most people would speed up, the OP did not and if he learnt KM he would have got up immediately to minimise a further kicking and if he felt justified neutralise the assailant. Running is the best self defence of course. It is fucking sad that people do this but it is a fact of life and you should do everything you can to minimise this happening to you.

racist....