As she focuses on the task he steps back a little further, leaving her to it, more or less. Occasionally he'll interject, usually some variation of don't tense up since all in all she seems more rigid than not. Her accuracy isn't as good as it was when she wasn't working for it, but for a beginner it's more than acceptable.

Eventually she's hitting the same spot, or close enough, with regularity that satisfies his (arbitrary) judgment.

"You see the difference?"