The pair seems somewhat more concerned that Ash might arrange their deaths out here. "Heh, and you call us evil. Harg might have a place for you in the Fangs, lass." Beyond that they seem to decide on shutting up rather than antagonizing her further.

At Talsarios' threat, they laugh uproariously, one of them choking out, "yeah, go for it."

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Note that Talsarios did make his check the first time and Ash the second time. It did help. For example, while they aren't willing to give in, they did give up some information despite themselves. But a good roll only effects the outcome, so when Tal threatens them with something that to them sounds silly (they know what the wand does it and it won't hurt them, so he seems foolish to them), they respond accordingly.