i experimented with that the 1st day i saw that on youtube. i was doing the 5 perks trick while leaving BOTH doors to juggernog closed. when i opened the "secret" door, it actually opened the bottom door to juggernog. i haven't tried this with 1 or both of the doors open before seeing if it'd still be the to open, although it might but i doubt it. sorry if this has been posted before & found by someone else but i've seen quite a few posts about it & i figured i'd say something as i've not yet seen someone else show or say anything. i apologise for no video but i've got nothing to record with. if you really want proof & do not believe me, just try it for yourself. also, i did this on ps3 only, as that's the only system i have. i also apologise for the wall of text, i'm using my ps3, i don't have a pc. i hope this helps, for what it's worth