The four chains William wielded sliced through the air at such speed that they almost seemed to form a blurry shield in front of him. Despite the rapid movements of the black chains, chopping the approaching zombies into pieces, the sheer number of zombies was overwhelming. William found himself being slowly pushed back. He was forced to retreat a few steps as the undead mass pressed forward. In such a narrow space, more than a thousand zombies were running towards William at full speed.