Helen is currently in the zombie phase, so her need for sleep is relatively low. Moreover, when she encounters danger, she cries out in a way that is absolutely chilling and could wake up everyone on the entire floor—a true human alarm.
Glisson, on the other hand, needs no further explanation; this guy sleeps whenever he can during the day. By night, his eyes are wide open like copper bells, filled with excitement. Moreover, the monsters above seem to be wary of Glisson, otherwise they wouldn't just flash by in front of him, afraid to confront him directly. These two make a sufficient night watch team.
Soon, the other groups had also finished scouting the first floor. The equipment team started setting up lighting and installing guardrails and warning devices near the elevator; everything was progressing smoothly. Then, the survivors from the vehicle gradually began to enter.