Assuming we kill them. Go to the village with proof of our kill. Show our military might. Offer to trade. If they can't use the scroll they are incentivized to trade. Or heck we could trade them our knowledge of how to use summoning scrolls in return for goodies, with Asuma's permission of course.
Not that I think this particular method has a high chance of success. But there is a non-negligible chance. And there enough other unthought of possibilities with non-negligible chances in order to add up.