"I was trapped in my seat. One punched me in the face twice. Then they all took turns to punch me. One passenger said afterwards they recorded the whole thing on a mobile." A female passenger took Mr Greenwood to hospital. He said: "I was bleeding, dazed and confused. They didn't steal anything, they just left me there battered and bruised. There is irony in the fact I'm a Victim Support researcher. This gives me a first-hand perspective."