Bucky doesn't even want to see the heart magic at work. He can only think of one thing - what happened to Wakanda?

At least Namor speaking of Shuri gets a twinge of Bucky's lips, only in the corner.

"She is. I'm not worried about her handling you." He would be surprised about Shuri not being agreeable to an alliance, if it hadn't been for the sin Namor was forced to speak of. "But I doubt she's well. She's lost her whole family."

She hasn't, but Bucky doesn't know that part.