Still reeling from his meeting with the Voice and discussion with Zeph, Sam was finding it hard to get into the headspace of actually planning for this fight; he was a pair of hands, and that was the most he could offer, nodding along to the ideas. Would this actually work? He had no idea, and he doubted it would work for a lot of monsters...but he didn't have anything better, so...
Hearing the orders and looking over the space, he spoke up: "I can lay out a perimeter. I've spent a lot of time here...I know how the houses are laid out, generally." Enough to make something that looked like one from outside, real and not obviously a trap. Using ridges and marks already in the ground from a building once-stood, Sam begin to go around and mark out the edges with stones and discarded bricks so that the labourers would know where to build.
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Sam marks out the perimeter!