Once in the observation tower when you round the corner the turrets open fire. If you retreat to right around the corner the turret will continue to fire a bit. If bullets hit the wall of the corner the audio cuts out completely until gun fire ceases. I have experienced this only here and have reproduced it many times (every time i try to be exact). The same way each time.
On a side note. If I slight push the left stick up and to the left and let go the character will continue to walk. I can reproduce this anytime I want. I thought maybe my controller, but after I tried this with every controller in my apartment and got the same result it was clear that this was the game.
