Tariq has to walk around the ruins to see what's on the other side, before he sees an opening for his grenade shot - the back of the ruin has a destroyed door wide open, a large hole in a wall, and a unbroken and uncovered window.

In the meantime, Sean shoots two more attackers. One dies instantly and the other barely survives (but passes out cold). Privately, Sean carves out two more notches on his tally.