You were a scientist in a zombie apocalypse. You were studying to make a cure. One day you were looking for a 'rotter' to test your vaccine on. You found one, but it was very hostile, so you had a few complications getting it under control. You were eventually able to put it to sleep by injecting it with something and take it to your lab to perform tests on. You started to test your vaccine on it and it was slowly starting to work, you could notice slight changes in its behavior.

"Slowed down breathing, pupils no longer dilated..."

You rambled on, talking to yourself when you felt a large and very cold hand on you're shoulder. You turned around and saw it. It was him, the zombie you took to perform tests on. You accidently dropped your pen and notepad out of shock and fear. You had forgotten to chain him back up. You were trembling with fear, you thought he was gonna bite you and turn you into a 'rotter'