These guys bore off on a boat known for stalling. The lead boat appeared to over stand the mark so it appeared there would have been room for a tack and then GE would have had rights for buoy room and could have easily avoided a collision as the boat can tack that fast, where they just stalled the rudders in the bear off. At the least they should bear responsibility for not avoiding the collision – it was not very avoidable they way they went about it, but that was not the fault of the other boat.
A got to the the circle first and GE was not overlapped so GE was not entitled to bouy room. That situation never changed even after A tacked the bouy room issue was settled when A got to the circle first and GE had no overlap, GE would have had no rights for room no matter what. The issue remains tacking too close and port starboard and depending on those in the room it could go either way IMO and it has.