Evolution?

Theodore's face was ashen after seeing what was at the end of the corridor leading to the laboratory earlier. Fortunately, everyone managed to escape from the giant zombie chase that was there. 

Theodore didn't know why there was such a zombie figure in this hospital, even though there was still a considerable time lag before these zombies experienced their first evolution. Even the zombies they encountered this time were more terrible than those that had experienced the first evolution. 

Theodore and the others were hiding behind the large counter on the second floor. They hid themselves as much as possible from the giant zombie. 

I don't know if they should be grateful, but a giant zombie just stayed where it was and had no intention of leaving. 

It was just that this would make it difficult for Theodore and the others to search the laboratory. However, Theodore felt they could most likely find Doctor Christopher there.