I just tried this, the guard followed me to the end of the corridor, then I heard a door opening and the guard said "here we are, just listen to the instructions and I'm sure you'll be fine."

I believe this bug's been in since the first 0.6 release. I remember screwing around with the guard and disabling him, and couldn't navigate further.

I find the explanation ! Beacause behind the door there are the chamber of SCP173......... http://www.noelshack.com/2012-49-1354624190-bug.png

This happened to me when i was playing v0.6.0 for the first time, and then i waited like 5min for the guard do something then i thought: "is this supost to happen or the game got a bug?" (sorry for my bad english/grammar)