I had one guy yesterday run ahead in Tok( whatever it was called, something about teeth, lol) by himself to battle the boss while the rest of the team was still in the cut-scene. I did not mind however that the barrier was closing without me in it. I mean, after all, I was the healer. I was not going to skip just to accommodate someone in a rush. He didn't last very long from what I could tell. The barrier reopened a few seconds later while I was still watching the scene unfold:P

Moral to the story? Be courteous to your team. If someone is running through the dungeon for the first time, wait patiently for them to finish. Its not going to kill you to wait for a few minutes. Well in the case of the guy on my team, his impatience did.