What is behind door number 3

I do not have much time to but I figured i better get some of this down. It appears like we might have to fight on several fronts. The party got separated during the fight with the a wizard. To fight the wizard we had to go through an anti magic barrier. At first only the monk and Steinbjorn went though to fight but when Steinbjorn dropped Steinbjorn's wife went running in for vengeance. I also went in, to cure Steinbjorn. After healing Steinbjorn the wizard ran. As I was following i recognized the area. I quickly ran back to the rest of the group and told them to try and find another way around, hopefully one that would not affect our magical items. So back to the chase, I made my way down the grate where I see that the rest of the group had stopped the wizard. What had me concern was the fact that Steinbjorn was standing over her getting ready to kill her. It is one thing to kill in the heat of battle it is another to do it when they are not able to defend themselves. Ah these magic users I am starting to see why they can not be trusted. Anyways we are down here in a protective bubble but the mirror is rippling and I can hear something breaking down doors in the next room over. It is getting closer time to prepare.