Didn't Eddie do a post about the glass door opening while using Invisibility?
And about Train, I believe i was kind of bored while trying far-ouro-shot strat to get 1:42 so i decided to try find some new trick or just fool around like i usually do when i'm bored.
So i knew there were only 2 good ways to save time on Train, Either manipulate Natalya's messages, or get out and keep her talking.
So after experimenting with diffrent ways to leave without her following i tried leaving fast using gold PP7 to take out all locks and then shoot ouro, and 5 seconds later i knew i had found a new strat.