You may be right about assumptions of the starboard advantage applying and the smaller yacht expecting Maltese Falcon to bail out and tack clear but no excuse for the collison notwithstanding - for either vessel really. Also, is there not a normal 500GRT exception as to an ability to rely on starboard-hand course rights? The skipper seemed to be total shock as he/she carried on with the genoa back-winded after the prang. He was probably checking his policy as a first priority! No doubt the US Coast Guard's report will be of some interest to the insurers.