Don't willingly give up the fish or the oasis! These are both in our sphere and should be ours to claim. We shouldnt give away stuff that hasn't been asked for. Just tell them that we will be settling on our side of the halfway point and that we will be getting the stone/oasis. Let them know that we really intend to respect the halfway point so that is as far West as we plan to go. We have made clear for a long time that we are interested in this area. Once they know we have our minds set on this location they will focus on other spots (ones that they might want to race for with another neighbor).