It does mean what it means! If any of the people who spotted you doing something shady get roused from their unconscious state, and you're still in the same disguise, you are pretty much screwed.
You were compromised at the end in the security uniform because the unconscious guards saw you attacking them before they went unconscious.You were unsure earlier in the video if unconscious people can be roused, but if someone spots them, they will wake them up. You were compromised because if any of them were found and woken up, they would remember what you looked like. If any of roused people spot you, they'll immediately recognize you and you'll be arrested. They will also report what you looked like, which will be reported over the radio, and then all of the bodyguards will recognize you and look for you.
The easy way to enter an uncompromised state is to just snap all of their necks. However, in that area, no other AI loops through there, so you would have been fine to leave, even in your compromised state.
I enjoy this series (in fact, it convinced me to buy the game), but it's getting a little frustrating watching and listening to Brad and Dan, because despite all their time spent with the game thus far, they still aren't learning a lot of the basic mechanics.
I just finished this up, and it was kind of a disappointment for me. It's just so linear and scripted that it never feels like there are any stakes at all. I felt done with the series after Uncharted 3 (2 was the high point for me because I loved the spectacle and all the different locations), and I should have maybe passed on this one or waited a year or two for the hype and price to die down. It's probably a 3/5 for me. The production values are fantastic and it looks great, but it has the same gameplay problems as all of its predecessors. The climbing is automatic, the puzzle-solving treats the players like idiots, and the shooting just isn't fun. The devs seem to have taken the criticisms of the shooting to heart but instead of fixing it, they just put in a lot less of it, which makes it lean more heavily on it's boring climbing. I don't think I like the characters enough to justify slogging through 14 hours of gameplay that I simply don't find enjoying.
Vinny, if you stagger someone and find yourself too far away to get to them in time to do a visceral attack, press circle as you run towards them to clear a ton of ground quickly so you don't miss your window. This only works if you're locked on to them.
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