Christa spoke as she said
' When i saw the zombies i just dropped on the ground and i was terrorized after seeing them.
For a moment i couldn't even move a inch, just as i was on the ground i heard footsteps approaching toward me from the left side of the corridor.
I was so fucked, my both legs were not moving because of the sensation of terror that made me weak.
I took out a knife and made a small cut on my hand, then my body was able to come to its sense and i ran toward the gate as fast as i could.
I am not sure but maybe some drops of my blood may have been fallen on the ground buy i was so concerned on just getting out of there that i forgot about it.
After i came outside, i closed the door as it was and went outside by the same vent.
I would have gone from the gate but then it wouldn't have been locked which may have given him the hint that someone sure cane there.