It's a tough one. But if you look at it logically, then the "rammer" is at fault. First of all, regardless of which lane you are driving in, you should always know what's happening ahead of you in traffic. If that was the case, the car in the left should have realised that there was someone trying to turn right and that, naturally, the cars behind it would want to merge left. In this situation I would either close up the gap or slowdown and get ready for the chance that the cars ahead don't see you and pull out. It's a common enough situation seen enough for people to be able anticipate. My general rule is: Never stay in anyone's blind spot or if you are approaching someones blind spot make sure you get ready to react to any emergency braking situation.