With the door now open, we get to see what is inside starting from the lower room by the open door: Roll 5 = Runner, 3 = Walker, 5 = Runner, 5 = Runner and 3 = Walker.

Edit: Now would be a good time for those with ranged weapons to take a shot at the first zombie. Then if we stick together, we have a better chance of defeating the rest that will descend upon us very quickly with all those runners on the board.