He could see that he had nearly managed it. He had provoked her, then provoked her a bit more, and now- "So you think you are a better teacher than I?! You think I don´t know what I'm teaching? Prove it! I challenge you to a duel! Now! Here!"
He had managed it.
"The duel will begin on the count of three. No unforgivable curses are allowed. The first to disarm or knock unconscious their opponent will be declared winner."
The Basic Principles of Defense Against the Dark Arts:
Understanding the principles underlying defensive magic
Learning to recognise situations in which defensive Magic can legally be used
Placing the use of defensive magic in a context for practical use
Umbridge stared. Her left eye was twitching, the fat at her chin quivered.
What about using defence spells?
"One"
The DA watched tensely from their seats in the Great Hall. They had spent long hours working for this, ever since the announcement that Umbridge would accompany Fudge for a brief visit to Hogwarts.
"Two"
Ever since they found out she had barely scraped an Acceptable in her Defense NEWT. Ever since they found out she had been the second-worst in the Duelling Club at her time at Hogwarts, only superior to Moaning Myrtle.
"Three"
"Stupefy!" Her curse bounced off his shield.
"Yes, I think I'm a better teacher than you. The first thing you should learn about duelling is a strong shielding charm."
Sweat was glittering on her forehead as she continued casting stunning spells and other minor curses on his shield as fast as she could.
"You should not tire yourself out with something that didn't work in the first place."
He raised his wand for his first offensive spell.
"Instead you should be creative."
"Avis" – a flock of birds shot from his wand, distracting her. Just for good measure he added a Bat-Bogey-Hex and sent her tap dancing."Obviously you can use Charms in a duel. But, that´s not everything. Nearly every subject can be of use in Defense."
A flick of his wand conjured up a Niffler.
"Care of Magical Creatures-"
The sparkling golden glitter on her shoes made the Niffler lunge at her feet-
"Herbology-"
The Mimbletus Mimbletonia that Neville had provided did not like the swarm of birds at all – or the fact that it was hovering upside down above her head- and did the only thing a sensible Mimbletonia could do in such circumstances-
"Or Potions-"
The new invention of the twins, Brewed-Boggart, standing in the front row, was dropped over her head, "NO! I'm not a half-toad! NO!"
"And of course Transfiguration-"
Several chairs turned into Centaurs, galloping around her, their arrows threatening her...
"You should also know your opponents weaknesses-"
He allowed himself a tiny smile.
"And your own strengths... Serpensortia."
His hiss made the snake curl around her foot, the one that wasn't occupied by the Niffler, and climb up...
"You should never give up; no matter what the odds are... always keep on fighting..."
Nothing but the noise of the various animals and creatures could be heard, and her whimpering.
"And then end the duel with a nice and simple spell. Expeliarmus."
He caught her wand and turned over to the Professors´ table. "I take it this ends the duel?"
Fudge spluttered. McGonagall beamed. Dumbledore twinkled. Nodded.
He tapped her wand with his, muttering. Then threw it back.
He had barely made three steps when he heard an enraged "Crucio" behind him. He didn't turn.
Her screams made the Niffler back off. The Centaurs flinched. The still hovering Mimbletonia sprayed another load of stinksap.
"And you should always make sure your wand points away from you."