It wasn't actually a chainsaw, aa -- it was a reciprocating saw. (I only know what one is because my DH has one. Here's what it looks like:
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I'm sure this type saw would also make (please excuse) splatter, etc., but prolly not as much as a chain saw. They would have still have had quite a clean-up. I don't know how loud they are, but some loud music would prolly help disguise it, at least.
I too, aa, would like to know where that saw is... prolly at the bottom of a dumpster or a body of water somewhere between here and Texas.