In the situation that brought this up:
The first boat (Boat 1)to the wall had a boat behind and a little up (Boat 2). The hail was made and the first boat tacked at essentially the same time as the second. There was a slight lull with a header so instead of clearing the next starboard boats coming down the line (Boat 3) as it appeared they would have been able to do, before the first 2 boats had gone even 1/2 a boat length there is an impending collision. 1 and 2 are close enough that they both cannot bear away to duck without hitting each other and 1 is far enough across with no speed so the slow stalled tack would have placed them in a collision if the 3rd boat coming did not alter course and then boat 1 was back in the situation of having no water and no speed.
The beach discussion had boat 3 as the at fault boat even though they had no hail for failure to provide room. They were not hailed and the situation changed in such short time and distance, that only some really good sailing avoided a wreck. Boat 1 was on port even though they were not even settled in let alone moving to effectively maneuver. My question was how far do they have to go on port to be considered the non-right of way boat? Yes they were able to tack again, but that move placed them back in a no water position immediately after the tack.