I've used lances extensively. My father specialises in them, though my preference lies in the sword.

[It's noticeable, how much he visibly perked up when he mentioned 'my father', moreso than when he was handling that strange blade. That's right, Byleth was a daddy's boy...]

He'd definitely be interested in that weapon as well... if only to have something novel to fight against.

[Though, knowing Jeralt, he had likely encountered a weapon like that before. That man certainly got around in the centuries he's been alive... he's basically seen it all...]