Is it time to start calling out bad cyclists?

Heading north this morning towards Old Kent Road along the old Peckham canal route, ahead of me are two cyclists (about 10 metres in front) and ahead of them (about another 10 metres) a man and young child on foot crossing the path just before where the Peckham Hill Street bridge also crosses the path. Anyhow, cyclist two is gaining on cyclist one and decides to cut round his left-hand side before the bridge, taking him directly into a collision course with the two pedestrians. He starts the manoeuvre then seems to spot the man and child for the first time and cuts hard right contacting with cyclist one side by side. The two then swerve left and right locked together for a bit before cyclist two breaks clear clipping the front of cyclist one who finally ends up on the ground. Crappy manoeuvre, but what really annoyed me was that cyclist two was all set to continue to ride away leaving the first guy on the ground. I shout after him and he reluctantly comes back to the scene where cyclist one is now flat on ground holding his right hand and groaning in pain. Cyclist two is pretty nonchalant about the whole thing, like “it’s just one of those things, nothing he could do about it”. The guy on the ground is still in shock and pain, whilst cyclist two is busy making his excuses and he then decides there’s nothing more for him to do here so makes a few platitudes and leaves. I now feel I should have made him wait longer, and have spent all day pissed off about his lack of concern and for the injury he’d caused. Don’t know what the outcome was, sent cyclist one on his way home on foot (since he said he only lived nearby) to go and have his wrist checked out (looked like it could be a fracture) but really goes to show there are plenty of idiots out there who exercise little or no anticipation of risk, whether on foot, on two wheels or four.