Was sitting at a light waiting for traffic to allow me to make a right turn on red. The stop light controls traffic on a 6 lane primary route running north and south at two opposing entrances to private commercial property. A north bound small PU waited for traffic to clear and made a left turn across three lanes of traffic into the opposing entrance. He was about halfway across the sidewalk adjacent to the southbound lanes when he was stuck at the passenger door by a southbound bike riding on the sidewalk. The bike was knocked sideways and the bicyclists hit his hip on the side of the truck between the passenger compartment and rear tire. The bicyclists never lost his footing and saw him wave to the driver as I made my turn. I assumed everything was alright but began to wonder whom was at fault. Who failed to yield to whom?