[Ars Magus. . . seithr. . . what??]

[he stares at her blankly, clearly only understanding about half of what she said]

It's-- er.

I haven't got a clue what those things are, but you're right about it getting easier once you sorta figure out how the flow words.

[and as if to demonstrate his point, he waves his hand back and forth in a smooth, curvy motion. to illustrate the word "flow," of course]