Someone Jack can probably relate to, at least in some ways, though the name of the martial art is unfamiliar. Gilboa's world might be like Earth, but it is decidedly not the same timeline, and American-named martial arts don't really exist. Because America doesn't exist.

He comes over and hauls the other person up with one hand, grinning maybe a little too widely, and says. "How about you give that a try on somebody who actually knows how to fight." That would at least give him something to think about besides magic.