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Sounds like a real knuckle-dragger
This just reminded me that on the way home from work the other day I saw five or so teenage boys riding at other commuters shouting 'no brakes!' (they did have brakes...) but one lad was riding along doing a one-handed wheelie while dragging the other hand along the ground. Yes, they were cunts, but I could not help but be impressed by the skill...
Assault by someone riding a bike on the footway:
https://www.standard.co.uk/news/crime/police-hunt-cyclist-who-crashed-into-group-and-then-attacked-them-a3648121.html
Very, very bad.