This started when an enemy ran up the stairs, I went prone and started shooting, he won the firefight with 0 health (The root of all evil), a teammate shot him, revived me and this happened, obviously it's not game altering, i just thought it looked weird but went back to normal when I fired some rounds. and the sound was experiencing the issue where you cant hear gun fire just certain explosions and music also I'm aware this is a normal bug and has been around awhile but it looked weird so i thought i'd share it.