It takes Muhali three tries to open the stubborn door, into a 30 x 40 room with a door on the east wall, and a door just now swinging shut on the north wall. You can hear a voice shouting some sort of command from behind the door, receding as you listen. This room is obviously a wizard's study.
You see a 30' corridor leading north, then it ends at a T- junction. You catch the flap of a wizard's robe exiting westward, and hear "Come on boys, hurry. We have company!"
About 15 feet away, you see a wizened man tugging at a door. He senses you and turns around. He draws himself up to his five feet in height and squeaks. "Who dares disturb the research of Pres the Imposing?"