Noise in Prison

[shootzombies]

I was just wondering this, in SH2 there is a part while your walking through Toluca Prison when you can hear a strange growling in a cell. Now I know what your already thinking- its a Patient demon right? Well when you shoot at it, it makes noises that sound almost human- kind of disturbing. I believe this occurs in the southern cell block (not the first cell block you go through at the start, the second). Now what I want to know is who exactly you guys think that man was? It may not have any significance, I mean it could have just been put in there to scare the player a bit more but its just interesting to me. Thoughts?