Rosa whispers back to Fenwick in Gnomish while the elder addresses the entire group. "Our purpose here is information."
When the shaman stops speaking, Rosa tries to cut in before anyone else can speak. "Honored elder." Suppressing a sigh, Rosa switches to Common. "As you can see, my comrades and I will need to carefully consider and discuss this," she says, hoping to cut off the general debate this has become. "I believe it really would be best for you and for us if you tell us about the other tribe first, so we can know a little more about the situation. After all, if we try but fail, that will be bad for us but it will also be bad for you. They might even grow more arrogant and demanding after such an attempt."
OOC: Rosa is not seriously considering turning the relic over in exchange for two slaves, but she is in earnest about wanting that information, and willing to consider other possibilities. She honestly feels that the elder should be willing to share some information if he seriously wants help. She fails to see what he gains from not telling them, anyway. Anything less will indicate to her that he is treating them as expendable pawns rather than taking them seriously.