Theoretically it could be relatively easy to code this way: If a Native Brave kills a European Blade (only) Unit it gets Promotion "Stolen European Blades" which you can see in Mouse Over of course. But this would then not be a new Unit of course and on Screen it would look exactly the same. It simply works completely different when Native Braves steal Guns or Horses: The Native Braves really change their Profession and get new Graphics. Thus the solution above would be a little "inconsistent" to the current feature. But for me that difference is no big deal. I just wonders if any of the players would really care about such a "mini change" that has almost no gameplay effect and no visual effect.