Not sure about this specific incident, but I know that it occurred frequently (almost every start) in the ACWS F18 NE fleet demo in Newport, where Jeff and I sailed different boats. While I am unaware of any dangerous incidents, the proximity of the Fort Adams seawall to a reaching start line meant that pin end boat was necessarily in close proximity to the seawall, and commonly invoked the obstruction rule/hail for tack by the next nearest boat. This cascaded down a few boats in one start. We generally all tacked in sequence, and in one instance we ducked the next nearest starboard boat that refused our hail (Jeff, 1 guess who that scofflaw was!...)-safe. Tactically, we figured that pressing the pin was a slow gambit. In subsequent instances, we and others, crowded the boat end, deciding that pin end was tactically a slow gambit. (In another instance, we just waited in the back, while the pack crowded and crabbed the boat end, and just heated up fast on port with a late start, and flew past a lot of people. That was our second best race of the day...)