"That is exactly it." Softly as to not bother any she applauds- it is no simple thing. Of course the next part is- well. "Attempt to hold your focus on the flame and the barrier as you pass it to me. I shall do as you did, extinguish the flame, catch the smoke, light it once more and pass it to you. Back and forth, yes?"

More advanced versions of this drill include melding magics on the barrier and removing one at one moment and doubling up the bubble of smoke and fire. But, baby steps.