The addition of Angelina proved to be a great thing to the gang as she had all types of wonderful ideas. The Prank against Sanctum was going to be legend- wait for it- dary. This led to a great brainstorming session and a great number of ideas turned up from everyone including turning his skin yellow, making him speak in different voices, etc.
The final version of the Prank was going to be played by the Twins as they needed Harry to have an alibi incase Sanctum blamed him.
With a complicated bit of spellwork which they'd gotten from the Marauders, Harry and Hermione keyed the Prank to happen as soon as Theodore Sanctum walked into the Great Hall.
The Marauders' Apprentice as Harry, Hermione, Ron, Draco, Neville, Daphne and the Twins called themselves were seated at their usual seats for lunch - at the Gryffindor Table- with the newest addition to the team Angelina from where they had the perfect Vantage point to watch as the Prank took effect. As soon as lunch started Theodore Sanctum walked in surrounded by his cronies, Crabbe and Goyle. The moment he walked in the Prank took effect and after a glow Sanctum was standing with glittery pink hair, hot pink robes and stilettos. After a moment's pause in which you could hear a pin drop, the entire Hall burst into laughter. The teachers tried controlling the students but after a bit gave up. In the immortal words of Pomona Sprout,"We tried." After several minutes, the laughter stopped only when Professor Dumbledore and the Head of the Houses made a few loud bangs with their wands.
"Yes yes whoever played this Prank, it is most ingenious. Now kindly turn Mr Sanctum back to normal so we can proceed with lunch." Said Professor Dumbledore. When no one came forward, he sighed and waved his wand to cancel the spell but all it did was make the enchantment worse. Now he had neon green hair and neon orange clothes and neon pink stilettos. "Mr Sanctum why don't you sit for lunch and wait for the spell to wear off?" Asked Professor Flitwick kindly. "It's all Potter's fault. He did this!" Yelled Sanctum. "Please don't accuse without any evidence Mr Sanctum." Said Professor McGonagall icily. "You won't hear shit against your favourite student. When my father will hear about this he'll have your job!" Yelled Sanctum. "THEODORE SANCTUM. JUST SIT AT THE SLYTHERIN TABLE BEFORE I PUT YOU IN DETENTION FOR THE REST OF YOUR LIFE!" Roared Professor Snape. Everyone was shocked as no one expected Snape to yell of all people at his own student. "And 200 points from Slytherin for disrespect towards a teacher." Said Snape. Everyone looked at the points table as all the emeralds flew out of the Slytherin's tower. And it turned red. "Um Professor Flitwick sir?" Asked a small trembling hand. "Yes Ms Li?" He said. "Why has the Slytherin's tower turned Red?" She asked. Before Flitwick could reply, Snape shocked everyone again by speaking in a soft tone," Because they're in minus points Ms Li." "Okay. Thank You Professor Snape, Sir." Said Su Li. Sanctum still was standing in the middle of the hall when he returned to normal. "Mr Sanctum now that you've turned back to normal why don't you take your seat." Said Professor Sprout. "I Theodore Sanctum, Heir Apparent to the Noble House of Sanctum challenge Harry Potter, Heir Apparent to the most Ancient and Most Noble House of Potter to a duel for the disgrace of House Sanctum at his hands." Said Sanctum in a loud and clear voice. Everyone in the hall gasped. "I don't think this is the time and place for this." Ordered Professor Dumbledore. "Sanctum you've just lost Slytherin all the remaining points it ever had. So I would suggest you sit down and eat." Said Snape tiredly. "Why Professor I would think that you're protecting Potter because he doesn't know shit." Said Sanctum. "No. I'm protecting you from losing as I am privy to what Mr Potter knows." Said Snape. "Why don't you let us battle then so we'll know who's more powerful?" Said Sanctum smugly. Just then Harry stood up and said," Professor Snape I would like to accept his challenge." "Harry are you sure?" Asked Professors McGonagall, Dumbledore and Flitwick. "Yes. Professor Sinistra would you like to referee the duel?" He asked as Snape sighed, tired. "Yes Mr Potter. We're doing it here?" She asked. "Yes Professor. Professor McGonagall please prepare a dome and get the students safe behind it. Professor Dumbledore.." said Harry before Dumbledore said," Don't worry Harry. I'll take care of it."
Hermione whispered," Are you sure of this Harry?" "Yes I am." Said Harry and he walked off. "Don't worry Hermione. Harry will win this duel." Said the rest of the gang. "I know. I'm scared all the same." She replied.
The dome was erected and Harry and Theodore stood in it. "This duel will end only when one of the participant is injured or cannot compete further. No Unforgivables to be used. 3, 2,1 Begin." Said Professor Sinistra. Sanctum had already thrown a spell at two and Harry dodged it. Sanctum kept on throwing spells and Harry kept on dodging them. "Why isn't Harry fighting back?" Dean asked Ron. "And why is Hermione not saying anything." Parvati asked Daphne. "That's Harry's style. He tires his opponents out then attacks. Sanctum is all bark no bite. See how his spells are off mark? Harry enjoys fighting like this." Draco replied to Dean's question. "Hermione is worried that's why she's so quite." Said Neville.
Inside the dome, Sanctum was taunting Harry. But none of his taunts seemed to work as Harry was basically working on autopilot. Finally Sanctum tired out as his attacks came in slower. Harry ended the duel with a chain of two spells, Expelliarmus for disarming him and Petrificus Totalus for petrifying him. "The winner of the Duel is Harry Potter of House Potter." Said Professor Sinistra clearly shocked at the repertoire of spells a eleven year old had. She unpetrified Sanctum and handed him his wand back which she summoned from behind him. As soon as Sanctum got his wand back he used it to send a sickly orange spell towards Harry which hit him and he fell. "Ha! Not so great now are you Potter?" He sneered. "Mr Sanctum. What have you done?" Yelled Snape as he and the Professors ran towards Harry. Sanctum just stood there sneering.