Upon seeing that a classmate was having trouble with a certain Counter Spell, Dunstan had offered to practice with her at lunchtime. There were a couple of other students also engaged in practical revision in the Charms classroom that day (supervised by a negligent professor in the corner trying to work), but Dunstan was focussed on Joella Wood, who he'd never actually had a conversation with before.

He was not put off or rendered impatient by the failed spell. "I felt the feather falter a bit", he said encouragingly, still holding his wand aloft, feather levitating before him. "Are you picturing in your mind's eye what you expect the spell to do?"