Hey. Im trying to get the Foxiest of the Hounds achievement, and I keep redoing the first mission I get at Sarif Plant.
I neutralize everyone, I hide the bodies, and yet, when I arrive at the glass bridge just after the hacker blows his brains out, a count down timer starts, as if an alarm was triggered and Im in evasion mode.

I didnt leave any bodies out for any cameras to see, and I neutralized EVERYONE, non lethal, I might add.

Did someone wake up?
Do enemies spawn in the areas that I have previously cleared and search for their friends, which I have meticulously hidden?
Or is it because of the firefight that occurs under the glassbridge, between cops and purists? That cant be though, that would just be silly... right?