Luna still wore a bewildered expression, and it was hard to imagine how she managed to have one eye watching Harry and the other eye looking at her classmates.
When the classmates began to practice in groups, and Harry walked up to her, she asked in an ethereal voice, "Are you going to personally teach me the Iron Armor Spell, Harry?"
"What else?" Harry shrugged, "After all, everyone has already been grouped, and I can't let you practice alone, can I?"
Luna gave an "Oh" and picked up her magic wand, drawing a circle in the air, "So, what should we do now? Should we start with the spell or the movements?"
"I think we should begin with the basic theory." Harry smiled and continued, "Before coming to class, you should have previewed what the Iron Armor Spell is, right?"
"Yes." Luna nodded, "The Iron Armor Spell, the incantation is 'Protego', is a spell that can resist various curses. It can create a magic barrier to deflect spells and physical entities, thereby protecting specific people or areas—the summoning talisman sometimes gets bounced back to the caster, or sometimes dissipates or deflects when it hits the magic barrier."
"A very standard answer."
Harry glanced towards Annie, only to find her absent-mindedly teaching a Slytherin girl in front of her, her eyes constantly darting towards Harry.
"So," he continued, "try to channel your magic power to form a magic barrier in front of you."
Luna followed the instructions but couldn't get it right after several attempts.
"Don't overly pursue perfect gestures, the heart of the spell is to believe." Harry said again, "Try a few more times—"
"Protego (Armor Protection)!"
A small, incomplete barrier appeared from the tip of Luna's magic wand, and only then did the young girl smile.
Small but cute.
"I seem to have succeeded, Professor Potter." Her voice was light.
"Keep trying, well done." Harry clapped to show encouragement, "This is just the beginning, keep practicing, keep trying, until you can uphold a perfect spell."
"Okay, professor." Luna smiled happily, continuously using her magic wand to simulate various shapes of barriers, being very playful.
Harry didn't say much more, proceeding to watch the results of the two-person practice sessions happening below.
Truth be told, most of the students' teaching wasn't very successful—only Ginny had an outstanding barrier, she, like Luna, could uphold an incomplete barrier.
"Harry." Annie called out, "How do you feel?"
"Feel about what?" Harry didn't understand what Annie meant.
"Teaching, of course." Annie winked with a smile, "I think applying to be a Defense Against the Dark Arts professor at Hogwarts after you graduate would also be a good choice?"
"Then you might as well kill me." Harry rolled his eyes, "Just one academic year has left me so exhausted, I can't imagine if I taught seven academic years simultaneously, how worn out I would be..."
"The more capable ones do more work." Draco said from the side, his student was doing pretty well, already able to uphold half a barrier, although it still looked a bit drafty.
Harry waved his hand, not saying anything, and continued observing everyone's practice and teaching, occasionally answering classmates' questions.
Talented children like Luna are still quite rare, but those who proactively attend the fifth-year Defense Against the Dark Arts class have a decent level, at least by the end of the class, everyone had essentially grasped the Iron Armor Spell, though the level of mastery varied tremendously.
By the end of class, Harry felt very satisfied with everyone's learning progress.
This was far beyond his expectations.
He learned long ago that not everyone has the same spell talent as he does.
So he did not harbor much hope initially, just planning to go for a long haul.
"To accommodate new students," Harry spoke up again, "we did not go over any other lessons this class, I hope you will review the Iron Armor Spell seriously after you go back, and next class, we will learn some new spells."
"Hooray!" The Weasley twins shouted in unison.
"Can you tell us what the spell is?" Luna asked curiously.
"That's a secret." Harry raised a finger, "Of course, I will reveal this mystery in the next class, so... please look forward to the next class... Class dismissed!"
"Goodbye, professor!" The classroom echoed with uniform farewells.
Alas, that damn Umbridge, look at how the students have been cultivated? Harry grumbled to himself, then left the classroom with Annie.
Returning to the hall together, Annie asked Harry about various spell usage tips along the way, and Harry patiently answered them one by one.
The Salu siblings have a very high level of spell talent, which can be seen from how Sebastian could self-learn the Three Unforgivable Curses and become skilled.
What a fierce individual, without a teacher, solely relying on self-understanding, mastering the Three Unforgivable Curses...
Born a few decades later, wouldn't even Voldemort have to serve Sebastian tea?
Hugging her textbook, Annie's eyes sparkled with little stars, constantly praising Harry for his extensive knowledge.
Harry actually quite enjoyed Annie's admiration, as essentially, he was also just a teenage wizard, albeit one whose spell proficiency was slightly higher than others'.