Yeah, turns out the room with the computer was where Tox was all along. It was a simulation.
Anyways, Waffles and Tox are not in the room leading the church, but the control room for the simulation. Which means the person outside killing all the zombies is a construct of the simulation. I wonder who?
There are two exits. One in the room you are in now that leads to the mall(which is mostly suffering from a lack of gravity currently), and the one already mentioned that leads to wherever this boss fight is taking place is taking place which is by the farm in the cabin next to the pool of shit(however you can't join the boss fight by entering this door unless the GM says otherwise).
I suggest you see if you can do more stuff on the computer before you go outside, to give m-I mean the game construct more time.