peteblue
Welcome back Wayne
Quite a bit I'd have thought. Such as that he hasn't been 'let off', but rather the sentence was suspended as a result of the court being informed that the young man with the knife had previously been kidnapped, bundled into a car and forced to sell drugs. It also wasn't shown in your still image that the car that was being attacked had swerved out of its lane at the guy on his bike, or that the driver declined to give a statement to the police, suggesting the two of them knew one another.
It's undoubtedly an awful state of affairs, but alas the kind of simple narrative you're trying to draw from it is best left to rubbish like the Daily Mail.
Never mind the simple narrative, did you actually see the knife he was using.....