It's not that she's completely unflappable, but she does, generally, feel like it takes a lot to flap her.

This is no a lot. This is a full on shift in reality. She stares out the window at the – are they in a mountain? – and has no idea what to say. Which is fine, because Shuri is explaining about the mine and the meteor and she's just trying to absorb it before it runs off her like so much water.

"This is all vibranium?" she manages, finally, astonished. "The whole mountain?"