Glitch? Hangout on exit dock

So, some guy was hanging out on the exit dock for over 20 seconds. I exchanged fire with him, then backed off figuring he was leaving in 10 seconds, based on where he was on the dock. Approach the dock 20 seconds later and he pops out behind a crate, with a pigeon of course, way inside the dock.

Only possibility is he ran outside of cover in the midst of a gun fight to reset the timer?