You're missing my point. Once the px has reached equilibrium. ie the air went out of the 1-11 but once that was over some must have been forced back in. My argument is that equilibrium is very slightly in favour of air in, ie the cabin may be 10,20,50 or a 100 ft lower than the actual alt. Some insignificant but technically quantifiable amount. I never mentioned maintaining a normal cabin diff, that would be stupid.
The Antonov I referred to definitely had a forward facing freight door, it was the entire nose of the aircraft and not unsurprisingly the airframe was lost.
I totally agree that this is entirely a theoretical thread and that in any actual event, the situation, workload and discomfort will leave you fresh out of ideas except the hopefully well drilled and rehearsed ED.
I still beleive that the indications you look at on the px system are likely to be in error. You would have to talk to who ever designed the system but it can only compare internal to external px. So there must be some sort of snapshot calculation which will be resolved and displayed but since you've descended it will be technically incorrect. No doubt the rate it takes snapshots will be fast but it will not be instant.
Here are a couple of questions back at you;
If you think air continually goes out of he aircraft will it get cold?
Will the px and temp change cause moisture in the cabin to condense, would you get a mist and would it last long enough to see it go out the hole.