It is pretty cut and dried with over lap or very close following boats that have to give room and also passing along the obligation.

If there is room to pull off a tack but not cross but the following boats are so close that the tacking boat has to pull off a emergency bear away to duck. How is the distance or amount of room judged? If there is a collision then the argument is that there was insuficient room provided vs your are not a good enough sailor to handle your boat as I saw pleanty of room to duck.