Here is what you need to do after open the gate to the doctors quarters:
*Call down the zipline
*Person who is getting into the glitch, runs up to where the zipline was, goes towards the stairs and dies in that doorway.
*When that person has died, the other person/people kill the remaining zombies then take the zipline back up.
*Person who died buys a gun quickly (pref. thompson) and runs to the people on the zipline.
*One person crouches into the corner of the zipline facing the main hut (right side)
*Person who died jumps onto his head, and onto the wooden plank of the zipline, they then move to the back of the barrier.
*Team mates sit on the edge of the zipline as if they were about to fall off, and walla!
The zombies should run to where you died, and your team mates will be safe but when the hellhounds come, ask them to back into the main hut otherwise the hellhounds can still attack you. You can get out of this glitch at the end of a round and buy a gun, then get back in
+Rep please