I occurred to me the other day that the "correct" way to deal with this type of behavior - assuming it really bothers you - is to do nothing. After all, one person fighting any Hunt that actually matters isn't that much of a threat, chances are they will either die or the actual attack time comes up long before the monster even takes noteworthy damage. Unfortunately, doing nothing on the scale necessary for it to be effective would require unprecedented levels of cooperation. I doubt you could actually get that many people to cooperate.