In a recent game a player put an holographic projector in the second floor entrance to the secret room while two players were inside the secret room. Now one of those players play "advance", returning to the second floor entrance. Does "continuing in the same direction" means he advances again, or is he "unable to do so" (as going from the secret room to the entrance is not really a "direction") and he stays in the entrance room? We played it the second way.
Unrelated question - is -1 the minimum alarm rate? 8 is explicitly said to be the maximum but I didn't see anything about -1. Can "secretaries" be used to lower the rate from 0 to -1?
I can only tell you how I would rule for the prototype; I can't give you an official answer (and I don't imagine someone else will).
When moving from the basement to a room with the oil slick, I would say, you do keep moving; if move in got you there from the basement, you move in again, if move out got you there, you move out again.
And the alarm rate can't go below 0.