Severus, pedantic bookworm that he is, would argue that protection from Dementors and flying, man-eating evil coats (sigh) are not the only reasons to want the ability to make a Patronus, but that's for another day.

"I've theorized it's a matter of taking the same sort of magic, in different applications." He thinks Antonin, a spellcrafter himself, will be able to follow this logic, even if he's being cranky about it. "It wouldn't be the only factor necessary, but it should wedge the door open for improvement."