It is significant that the tenor of posts here is not about whether the OP is at fault (which is the case) but about finding ways of coercing the driver not to ask him to pay for the damage his carelessness caused, or how to get away with it.
My wife had an accident once, rammed up the rear in my company car when she stopped at a roundabout in a classic piece of not looking by the chap following her. He apologised and they exchanged details and went home.
We were thus taken aback to have his insurance company tell mine that she was at fault as she had moved sideways on the roundabout, out of a slip lane, and he could not avoid rear-ending her. The biggest shock was that we could not even remember such a turning-left-only slip lane on that roundabout.
I drove round to it and saw that there was one, but we still could not understand, until I rang the highways department and discovered that it had been installed about a week after the accident. The other chap was thus caught out lying to his insurance company and solicitor. Not clever.
In this case we have a driver, in the middle of coping with one idiot crossing when they shouldn't is confronted by another, from the direction his attention is no longer focussed on, and then, later, what amounts to a conspiracy to defraud them of their rightful damages.