So you have to screw up to make the script work as intended. Sounds like a glitchy piece of shit mission to me.
Speaking of glitches, pulled a guy off a guard tower, made no sound. Then he proceeded to scream while knocked out on the ground.
Not screw up, like I said, you can wait for it, I did that and it worked. It's the time for the interrogation that's weird. The only interrogate at night and if you infiltrate at night, for some reason sometimes the game begins the interrogation at sunrise or close to it.