In Yaklo's view, humans were unlikely to just appear in the Sub-human Kingdom that despised humans, even if he was a down-and-out Monster Tamer.
The reason this Monster Tamer had brought his demons here was probably because he had heard that the slave business was booming and the market price of elves was high, so he risked coming to the Elf Forest to plan on snatching elves and making a big profit.
Unfortunately, this Monster Tamer's plan overlapped with their plans.
With such a big commotion, regardless of the outcome, the Monster Tamer's plan to make a big profit was ruined, which was why he had rushed into the fire and confronted them to demand an explanation.
As for the Monster Tamer coming to save the elves, the chances were so small they could be ignored unless he was an incredibly foolish idiot.
Based on the principle that less trouble is better than more, Yaklo had proposed this transaction.