To clarify, it appears that these D-Bees came to this valley from the south. They have been staging raids into Cartouche, scrounging what they can. They have run into some resistance, which lead to at least one of their own dying, and they may have carried the body back. The townsfolk did not mention any such fight explicitly, only that they don't think any of the townsfolk had yet been harmed.
The DBees do not look harmless. They are fierce and predatory but a dragon is a tough nut to crack.
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The story as it comes out is that, just after you left, they sent word to Castle Refuge that a series of raids had occurred again. These has happened before, but some application of firepower by the Coffin Nails had ended the threat. The beastmen were driven off.
Now they're back, attacking the outer homes and raiding for food or supplies. So far, no one has been harmed that they know of, but they're pushing further into Cartouche.
They're now fleeing back to the south on the original path, past where Tipolei is hiding. Following the other path means following them.