Ugh had this happen. Tank didnt get what they wanted and bailed. We waited for a new one, got a mentor who was bright, friendly and a load of fun. He asked what had happened, we told him, he groaned and away we went.I thought "Oh no, what am I walking into?" Turns out the healer only queued hoping to get a specific item from the dungeon, and then when they got it they immediately left.
Fast, smooth run.