I met Ryan at his Bassin' Inn motel/restaurant at Choke Canyon about twenty years ago and we chatted a bit. He said his first reaction was oh shit here he comes then as Robin was about half way Ryan said Robin looked confused and hesitated. (Robin has said as he charged he realized Ryan was his dad's age).
Really Robin was in a no win situation. Hit an old man or stop like you're chicken. He found an even worse option, getting his ass kicked.