The bikers fault doing 100mph the driver in the car had no idea how quick that bike would get to him
Driver said he didn't see him.
If he DID see him, and had "no idea" or wasn't sure of his speed, then he shouldn't have crossed, or at the very least made a decent effort at crossing quickly.
Yes, the biker was at fault for speeding, but you don't pull out because someone else is doing wrong... I really hope he just didn't see him.
Either way, the biker paid the big price, RIP.