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There is a staircase n Junkyard where if you hug the wall and slightly slide off and thenquickly hug the stairs again and you will be on a ledge where crawlers cant get you I will post a video soon.

If it only works for crawlers, what's the point?

If your partner is away and you have to sit there for a while he cant get you. I dont know possibly someone could explore it further to get to a spot where full zombies cant get you

No you cant stay there for 2 much. The zombie will die and a new zombie will come and he wont be a crawler.

Used to love this glitch until it got patched