(James doesn't know that and he thinks she would be upstairs.)

James is running up the stairs and then calls out on open channels " Mary what floor are you on. I'm just passing floor 6 and heading up." He just hopped she could still answer him.

The spartan slammed a new clip into his assault rifle and mowed down a horde of small creatures that looked like they had masks on and a triangle on their back. He walked backwards quickly and when he got inside he closed the door and took out a small blow torch. He used it to melt the area between the doors so they would form together. He turns and then heads for the stairs.