Scuzzlebutt

So I'm in the mission where Randy wants me to break into the "taco bell". I got past the two front guards, dispatched the next guard by electrocuting him, and used the alien probe to warp onto teh room. However, when I go to smash open the vent, nothing happens. I've tried different weapons, leaving the area and coming back, and exiting the game and restarting it. Nothing seems to work. Please help!