When you are in the building world part two, use the following trick to finish this scenario quickly. After the scene when Richard Spectre appears in front of you, take the elevator and go to the bottom floor (by using the bottom button). Go out the elevator door (do not take the stairs). Once out, you can see the corridor to the other side of the bars. Then go into the elevator, leaving Eileen behind. You can now continue to the stairs and pass through this corridor. You can see Eileen like a animal on the other side. When you pass this corridor in the another scenario, you must wait for Eileen because she is running behind you like she was there all the time.