Former financial analyst Christopher Cole, 32, wrongly believed builder David Pietraszek was Russian when he attacked him at Bond Street Station on 9 June.
Mr Pietraszek, 21, had earlier stepped in and put Cole in a headlock when the drunken yob was being abusive to other passengers on the Central Line.
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Shocking CCTV captures Cole, who has 18 previous convictions for violence, follow Mr Pietraszek before shoving him off a Jubilee Line platform just 34 seconds before a train arrived.
The victim said he could feel electricity coursing through his body and hear the train thundering towards him.