Eustace frowned a bit upon seeing the bones before stepping close, crouching down to one knee.

"Given the debris, this must have been the owner of the bag." He then turned to the covered door. "Which begs the question if he was also the owner of this place, a wayward wanderer—or a victim."

It wouldn't be impossible that the person had been killed by the real resident of the tree, but just as likely they had been lost in the woods and unable to open the door to seek shelter and ended up passing. Or it could be completely irrelevant, there were just too many possibilities.

Standing, he looks at the door a little warily, but also curious.

"Should we try and investigate? It could also be a trap."

This tree was rather large...and he had faced actual monsters in the form of trees before in his own world. It wouldn't be so impossible here.