Doc & Xie Yun
Given what he was used to fighting, Doc had a large capacity for believing in things that others probably would not, even with with proof staring them straight in the face. There was not too much in this world or his that could surprise Doc anymore.
As Xie explained qi, Doc leaned forward, clearly interested in what the young man had to say. So that meant Doc possessed qi too. Of course, the gunslinger had no idea how to tap into this ability or if it was even possible, but he was fascinated to know, if with training, he could.
"Interesting. So, with training you can learn how to use this qi in a fight?" Doc asked, curiously.