Thom Powell's hypothesis makes a lot of sense
How he said the "wood knocks" are actually sasquatches clapping their thick hands in front of their mouths. His impression sounded just like someone banging on a tree. It makes more sense they would do that instead of carrying a perfect knocking stick with them at all times, or immediately being able to find one if they needed it. That's probably why the team rarely gets a response, because they're not doing the "knocks" right.
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