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Seriously. Kick him in the fucking head. Knock the phone out of his hand and crush it (his hand, and the phone while you're at it.) Step on his neck. Don't sit there and fret and worry and be passive. Flip the fuck out on these people. I defy anyone who goes medieval on these cunts to find a single witness who will testify against them. Anyone you find who might have witnessed it will suddenly have been reading a newspaper or checking their messages or looking out the window of the train.