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As far as chunking down goes....many times, it makes sense...specially if the wood has to be cut anyhow...small drop zone...no desire to bother with blocking...ground crew busy with clean-up..etc etc.
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Theoretically, there are times for chunking down small wood, but I don't think that this was it.
I think that his ground crew was more likely busy doing something else, like not being present. I doubt that he was just pulling one out of a bag of tricks. With that open dropzone, I'd just drop them in multiples of firewood lengths, then cut them on the ground. No ground crew required. Nothing too big to move into a good cutting position. A lot would already be propped up off the ground to some extent.
Bad technique, bad PPE.
He's trying to advertise himself. Can't knock him for that. He didn't even disable comments, where he is having his A$# handed to him.
He might be almost done with his pruning job and was concerned about dropping big blocks that might break a large, superficial root, so he was using the small blocks a pad for the larger ones.
Oh, that was a removal.