Yesterday I opened a group to run Bloody Crypt. Not a very popular quest, so there were no responders for a while; I was just about to start it solo (with cleric hireling) when someone responded. I am level 10, he IIRC 12, so with two of us and two hirelings Bloody Crypt on hard was a breeze. Yet when we were more than halfway done I got three party join requests. I accepted them all, but two never made it into dungeon, while third apparently got in, waited by the entrance to Salasso's chamber until we opened the last key, then died. All I ever saw of him was his soulstone.
I feel bad about such latecomers, so my question is -- how do I make my group "full, no more accepted"? Other than just ignoring join requests, which I feel is rude?