Sure my fault for not killing the guys in the door first but you know kinda thought the little mines in the doorway would go off and stagger them and make a sound so I could turn and be ready for them, that and I saw the guy on the stairs was one of the dual wiled melee guys so saw him as more of a threat then the guy poking his head in the door. But no apparently not only do mercs make no sound at a full sprint they can set mines off with out making a sound. Unless the game decided screw you and despawned them just before the mercs went in the door witch with my luck is totally possible. Worst part is this happened right after a match were the game froze but still had music playing and after ten mins of waiting nothing changed so i had to force quit the game and lost all my gear witch is the only reason I was going in to a strong hold. Like unless my game is just bugged and they do make foot steps they really need to add them