Doc & Xie Yun
It doesn't surprise Xie Yun that Doc didn't know anything about qi. There were not a lot of people outside of his native land that did. Or those that were big into martial arts. It also depended on what their cultivation was and if their Sect had a certain way of training their disciples.
He gives Doc a soft smile," I don't mind explaining." He takes another sip of drink before getting a bit more comfortable. "Qi is the life force, the energy that circulates through one's body, through everything."