Ok, due to several reasons (not having an afk time out, not being able to kick players) there was an instance of dungeon harassment today.
Player joins party, starts pulling packs to try to get everyone killed (not a tank, it was purposeful) then when I realised and just stopped healing them, they just ran to a corner and went perma afk so we could no longer finish the dungeon, meaning we all had to leave and WE got stuck with 15 minute lock out timers!

I was really enjoying dungeons up until this point, now, after just one instance of this I have a very bitter taste in my mouth and feel reluctant to run more.