TCL
A Met Police spokesperson said: ‘We are aware of social media footage showing an off-duty Met officer on a mainline train on the afternoon of Thursday, 3 October. The footage on social media is a limited capture of the incident, which is believed to have lasted in excess of 20 minutes.
An update on this event. The bearded man was previously, on the train,threatening violence to passengers. That was communicated one assumes by passengers to BTP.
As I mentioned before. We only see a short clip but not the whole 20 minutes.
https://metro.co.uk/2019/10/04/police-officer-revealed-man-headbutted-commuter-packed-train-10864857/