"I saw two guys coming towards me but didn't think anything of it. They wore trendy coats with the hoods up, trainers and baggy combat trousers. They were about 6ft tall, in their early twenties, and black. I moved to the left so they could get by - and then, in the split second as we passed, one of them punched me very hard under my right eye. I clasped my face, and started whimpering, "I'm terribly sorry, I'm so sorry." I was so shocked, I thought I must have walked into him - although looking back, I can see the fist coming towards me.