The walkthrough states:
He talks about the Great one. The Great One returns! He is so loud that it alerts the male nurses. They are coming!
Escape: Immediately go to Gygax' office at the parallel corridor. Enter the office.
The word "immediately" makes me think that it is important to get through this sequence without taking the time to sightsee.
Just follow the walkthrough step by step and you should be fine.