I am preparing to go in brisk breeze with an assembling group and I have read online that you can't port to your friends if you die and flee. How would you access the tower on the level where your friends are currently fighting?
You heal, return to the tower and enter ALONE. You will rejoin the same instance that your group was in and will be able to walk through the (empty) rooms/levels until you get to the room/battle that your group is in.