It's useful, and you're helpful.

[He tucks his hands behind his back, satisfied with her return and the entirety of her demonstration.]

Even if it's not casting fireballs, summoning a thunderstorm, or that Scorching Rays thing, I think that's cool in its own right. Useful. [Henry glances back to Caleb, then to Nott.] Just my hunch, but I bet you two are a great duo. Are you waiting for him to wake up?