By the looks of things in the preview, the group really should have went out and secured a back hoe at some point. Could have dug a nice 8-10 foot x 8-10 foot trench all the way around the farm.
Zombie horde (or any stray zombies that come along, for that matter) would fall in, and they could kill them easily without wasting ammo, and without ever being in any danger.
Of course, that would make for a pretty boring show I guess.
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