He needn't have worried. The two zombies that shamble into the plaza don't appear to understand the nature of the blade in front of them, because-

Well. They walk right into the thing.

As the WHACKITY SPLUD CHOP THUMP noises die away, from somewhere over the rooftops in the distance, a man's voice can be heard triumphantly proclaiming: "For it was said that they had become like those peculiar demons which dwell in matter, but in which no light may be found."