If Lan Xichen wants to lecture him later, about the value of flutes and human lives, that's one thing, but if they're already planning to cart his brother-in-law off to that place again, he'd like to know just how to stage a rescue operation, should it come to that. Information was just a bonus, if he happened upon it.

"I'll let Lan Zhan know," he nods. The change in topic seems abrupt, but the plan is about as set as it can be. And if there's something else he's found that's important enough for Lan Xichen to want to discuss it with him, he won't say no. If it's one of the gifts from home, it could be useful. Maybe they've repaired Zewu Jun's flute, or brought him a guqin? Some of the Lan's sacred texts, perhaps?

"Oh? Ah- mm, yeah, what is it? "