Through the practice, Strange offers advice, suggestions, and help to try and get Yuya as close as possible to cast the spell. A part of him is a little annoyed that Yuya isn't picking up the spell but Strange realizes that not everyone is as quick at learning new magic as he is.

Case in point: Yuya looks queasy. Strange walks over to him and places a hand on his shoulder. "I think that's enough for the day. You might not realize it, but you've made wonderful progress. If you want to keep going, we can practice more tomorrow."

Because Strange has a feeling Yuya won't want to give up. They're too similar that way.