"Yes, of course. I wouldn't dare lie." Lothur said humbly, fearful of angering one of these creatures that could kill him with a stab.
He was giving up the demon in his hands to survive and have this opportunity. After all, his chances would be nil if he thought about dangerous things.
But he might as well try to negotiate with that toad later since this creature had no use for a Soul Bone, and he was willing to pay dearly for such a thing.
The beasts there heard him and realized that he was not lying, believing that such a human was not trying to deceive one of them.
These beasts were not friends, but they were concerned about maintaining the integrity of their possessions, something they could only do together. So they naturally had concerns about the giant toad in front of Lothur and the demon.
They also would not be greedy about the Soul Bone that Waloon would soon gain since everyone there had similar powers, and only one could benefit from it.