I was stunned, and now I'm about to try recalling this experience again. Exactly what I experienced with this system in the same situation can be explained by means of few words: 5.1 in-game performances are very spooky. You sneak ahead hearing people firing in the right front-speaker, but it's far away though. I'm able to hear my own footsteps in the center/front-speaker(s), but all the sudden I hear footsteps from behind me.