He listens very carefully, surprisingly so, and takes every word at face value. There's a tiny voice in his head telling him it sounds like nonsense, that something so huge and so dangerous needs more proof than second hand messages to be believed but - he believes her. It explains her state when he found her, even if it doesn't explain her state now.

But it's a more robotic repetition, more factual than emotional. There was clearly more to it, but he's not going to push the personal.

"It's what they used on Jedha."

It's a quiet comment, a quiet sign that he does believe her, as the reality of such a weapon sinks in. He'd rather be doubting her, to avoid acknowledging the Empire having so much power, but the air is too heavy to be a lie.

"We have to get your father."