just a comment on the original post:
if the whm(or whatever job) wasnt going to be able to play for a while, for whatever reason, then for what reason do they need their AF so badly?
if you couldnt use it till you get back, you dont need it till you get back.
if the mob was due to pop in less then an hour though, and there was a good chance of me geting the drop, id stay. no one needs help so badly they cant wait a half hour.
if there were 13 other campers there to btle for the NM, id just leave.