Hagrid turned around and hurried back toward his cabin, his face buried in his handkerchief. “Look at him blubber!” Malfoy, Crabbe, and Goyle had been standing just inside the castle doors, listening.
“Have you ever seen anything quite as pathetic?” said Malfoy. “And he’s supposed to be our teacher!”
Harry and Ron both made furious moves toward Malfoy, but Hermione got there first — SMACK! She had slapped Malfoy across the face with all the strength she could muster. Malfoy staggered. Harry, Ron, Crabbe, and Goyle stood flabbergasted as Hermione raised her hand again.
“Don’t you dare call Hagrid pathetic, you foul — you evil —”
“Hermione!” said Ron weakly, and he tried to grab her hand as she swung it back.
“Get off, Ron!” Hermione pulled out her wand. Malfoy stepped backward. Crabbe and Goyle looked at him for instructions, thoroughly bewildered. Rowling, J.K. Harry Potter and the Prisoner of Azkaban (pp. 118-119). Pottermore Publishing. Kindle Edition.

Harry calmly put his hand on her wand arm and forced it down as he stepped forwards. Staring right in Malfoy’s eyes and not blinking till Malfoy did, then Malfoy dropped his look.
“Hermione?” he asked in a calm voice, never taking his eyes off Malfoy, his hand now on his buckle where the knife he had bought was hidden away. And his other still keeping Hermione’s wand arm relaxed and down.
“Yes Harry?”
“Were you able to go with Hagrid to Buckbeak’s trial?”
“Yes. McGonagall allowed it. They just were in Malfoy’s pocket’s that’s all.”

Malfoy Jr sneered at that, though it looked funny as one side was decidedly redder.

“If I remember right, you were to the left of me, and I blocked yours and Ron’s sight of what happened. Right?”
“Yes. But what has that…. Oh. You saw everything didn’t you?”
“Yes. And heard. Everything. Except when I was on Buckbeak’s back.”

He looked at the three of them and held their eyes till they each looked away, “Isn’t that right boys?”
Mumble.
“I wonder what happens when I invite the press to the appeal and have my barrister show those memories. And get the sworn statement from Madam Pomphrey on your actual injury Malfoy?”

Malfoy tried to glower at him, but it failed massively. “You wouldn’t dare.”
“Oh, I think I’ve shown that I dare a lot. Gryff don’t you know.” Hermione relaxed her own arm.
“Have your father drop the suit to get the animal killed or sent away, and I won’t retaliate.” He let go of Hermione’s arm in preparation for his next move.
“As if you could.”

SMACK!
This time it was Harry’s open-handed hit straight across Malfoy’s cheek then backhanded to the other cheek, SMACK!

“Consider yourself challenged to a real honor duel. This one in the great hall after dinner tonight. Refereed by Master Flitwick himself. No seconds to take over. No Unforgivables. Magic only, no potions or anything like that. Everything else is fair game. And till honor is satisfied, not first blood.
“The terms are that the winner gets the Heirdom of the other, and all that comes with it from the loser.
“Be there or be labeled a coward and loser by forfeit.”

Malfoy feinted.

%%%%%

The twins were doing a brisk betting business throughout the school, right up till Flitwick set up the platform and called forth the participants.

Harry came up in his school shirt, trousers, and outdoor shoes. His shirt sleeves rolled up and his wand in its holster.
No tie, or robe to be found. But those watching noticed he had ease of motion.

As Flitwick was about to call Malfoy in forfeit, he slowly walked up on the platform in an ill-fitted dueling robe, and dual wands.

Flitwick had them both move to opposite ends of the platform and salute each other. Then, on his mark, begin.

Malfoy led off with twin acid curses, which Harry seemed to catch in a bubble and toss back with his wand in his right hand, while his left hand slid out a knife he waved, and Malfoy’s right leg went down as his Achille’s tendon was cut and slid away.
Malfoy oomphed and as he fought both the acid eating his left foot and the new pain in his right from the cut.

Malfoy sent a blood dissolver with the wand not trying to heal his injuries, only to try and dodge that as Harry dodged and flung that back and flung back another cut taking out Malfoy’s other tendon. Getting him on the ground solidly now. And a quick follow up of a crush hex on both legs. Causing a scream of pain.

A deep bell sounded as Sr tried to attack from the audience and hit Master Dueler Flitwick’s Shields around the platform. Ricocheting back at him and killing him instantly.
With Jr distracted, Harry delivered a crush spell from each of his mediums on the nearly unconscious boy. Taking out both arms.
Then walked to the out of it boy, and permanently marked his forehead with the word ‘Bastard.’

He bowed to Master Flitwick, “My honor is avenged.” And walked to the steps waiting for the shields to drop so he could leave the, now, Heirless and Lordless Malfoy behind.

Hagrid would no longer have to worry about his job nor his “innocent beasties”.