Preserve, Guarantee
The mouth of a tree leader is all about trying to preserve the trees. In fact, she guarantees that she will preserve the trees if it's the last thing she does.
Basically, a tree leader is someone who stands up for trees. Mostly she talks, but that can be a powerful skill to have.
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She chains herself to a tree to preserve them. But, unfortunately, the lumberjacks just take a giant back hoe (ほ) and tear this tree leader and the tree she's attached to in half.
What a terrible scene. Focus on the fact that they're using a horrible, modified back hoe. It's more like a weapon than a back hoe, and they show no mercy at all.