When your friend is walking or if the sound is out of sync with what's happening in the game, it feels like the footsteps are behind him. Note that after the High Caliber update, there was a drop in the overall sound quality of the game, there was a Mozzie 2 meters away from me on the Consulate map, he moved and I didn't hear, an Iana fell from the trapdoor on the edge of the map, I was in the safe, behind the first cupboard under the trapdoor, and I didn't hear.