see i think that's bullshit.
i see people do this ALL the time... like i'll be driving behind someone, i can TELL they're lost because they slam on brakes at every single road... then they'll put their blinker on, get into the turning lane & slow down, then cut me off while darting back onto the road & almost hit me...
what happens in that scenario?? if you're following someone, they slow down & get into the turning lane, then you continue on and as you're passing them they come back over & hit you?? would that be your fault too? since they didnt COMMIT to the turn??
that's damn stupid. the dumbass should have looked where the hell s/he was going before s/he just DARTED back into traffic.
i would get a lawyer. s/he could have ran you over and killed you because of how oblivious they were being. i swear to god motorcycles are invisible to some drivers.