"…" Out of all the things Valyr was expecting Mystia to say as a reason for her interest towards him, his actions greatly affecting the future of the world was definitely not something he had taken into consideration.
In his mind, he thought that the woman had taken an interest in him due to him being related to the Zeihardt clan, specifically the one everyone in the clan wanted to find. If it wasn't that, then it might be because he had interacted with her apprentice in the past and was curious as to what kind of background he had to be knowledgeable about Reinforcement Elixirs.
Nope. None of the possibilities he had come up with were the reason.
Though, pondering over it for a bit more, the possible reason about him being part of the Zeihardt clan was somewhat related to the response Mystia had given him. After all, as a Herald, he could command a level of strength that surpassed normal people.