Unfortunate casualty of reshoots. I had heard Giancarlo Esposito (who chewed the scenery in this as well) was added in reshoots and Copperhead was removed, but the adamantium blade was news to me. It's a shame because for anyone who knows where to look, you can tell there was more to the story, and that the theatrical release was cobbled together from something else. I had the same vibes when seeing Suicide Squad (2016) and Justice League (2017).It's not much, but that blade Copperhead used to slash Sam's armor was apparently supposed to be a refined Adamantium blade. This would be why Sam was wondering how he got cut, and would show us that a true counter to Vibranium now existed and could neutralize its effectiveness. So this has major implications for future Black Panther stories.