Just like the others, this is pretty sick in a good kind of way, but there are two minor annoyances here. First, why didn't Riggs just grab the transmitter and then run before the zombies could reach him? There were two-and-a-half hallways' worth of space between the zombies and the transmitter, and these are slow shambling zombies, not the kind that sprint after their prey thus Riggs should've had plenty of time to grab the transmitter and flee. Second, why didn't Riggs try to climb up into the ceiling in the caved-in-hallway? There was a rectangular opening in the ceiling and he could've used the rubble to climb up into it. Other than that, I have to say that the story and action is pretty good here just like I remembered. Nice job.