D-D-D-DUEL!

Flitwick "1! 2!.. 3!" he shouts and Krum immediately fires a flurry of spells of varying colour towards Reima while crouching low and moving to the side to make himself a harder target to hit.

Reima glances at Krum and tilts his head to the side while turning his body slightly to dodge all of the spells shot at him, with the speed the spells travel at and his incredible perception he would be hard pressed to actually be hit by one of these things. Another spell is shot at him and Reima just bats it away with his staff like it's nothing, causing the spell to ricochet at the ward before exploding into sparks. The students who were stood behind the ward fall on their asses as the spell explodes in-front of them, causing many to back away fearing that the wards wouldn't be strong enough to protect them.

Krum scowls as he sees his spells easily blocked or avoided and decides to change up his tactics, he points at the floor and raises his wand upwards, causing the stones comprising the ground of the great hall to slowly rise and form makeshift cover that Krum duck underneath. Reima just watches silently as his opponent enchants the stone he's hiding behind to strengthen it against impacts and spells. He's tempted to just walk over and punt the douchebag in the face and ending the duel quickly but doesn't wish to raise questions over his background and where he had learnt to fight, something he would be hard pressed to brush off.

Krum pokes his head above his cover and shouts "Confringo!" causing a gout of fire to shoot from his wand, Reima spins his staff in his hands as the fire hits it, completely dissipating the flames, despite there being no danger to himself. The audience cheers as they see this and even Flitwick is surprised as he'd never seen something like that before.

Seeing his attack hadn't done anything he decides to use a couple spells taught by Karkaroff, he takes some sand out of his pockets and waves his wand over the granules, they form into mini-golems in which he enchants with a couple more spells before flicking his wand at Reima to direct them towards his opponent.

Reima begins to walk towards Krum's hiding spot, his staff tapping against the floor and providing those watching with a forboding feeling. He notices a couple small figures walking up to him and he raises an eyebrow, he can sense magic in them but doesn't feel any need to worry. He kicks one away haphazardly and halts when he sees it explode as it hits the ward boundary...

Reima "Really? Mini-sand-suicide bombers?" he says aloud with mirth before tapping his staff on the floor and causing the floor to lift up and launch the mini-people over to Krum, who throws himself over his barricade in an attempt to escape the explosion. He barely makes it out with only his trouser leg on fire which he quickly pats out. He looks up to Reima in a panic realising how close he's getting, he gets up and starts backing away while shooting various spells at him.

Eventually Krum starts to look quite exhausted from throwing so many spells and as a last resort he raises another barricade that completely envelopes him in stone, hoping that he'd be able to catch his breath and not worry about Reima's advance.

A few people boo as they watch Krum hide away like a rabbit against a wolf but they fall silent as Reima approaches the stone structure in the middle of the room. He gives a few taps with the bottom of his staff and sees that it's solid stone that's been strengthened by centuries of magical encroachment, apparently using Hogwarts materials as a barricade is quite effective, especially since Krum has added even more enchantments to prevent him breaking through.

Reima sighs and decides to just "Fuck it", the axe head of his staff glows dark red as embers start drifting from it, the air around it becoming fuzzy as he became hotter by the second. Eventually even the audience can feel the heat being emitted by it, Reima raises the staff up over his head and slams it down onto the stone structure, slicing cleanly through it and he even had to stop the axe from continuing through the floor.

Krum who had just caught his breath inside the structure almost shits his pants as he feels the temperature rise and a glowing red "thing" slice through the wall, causing the rest of the structure to collapse, leaving him sitting below his opponent without any cover.

Reima hefts the axe over his shoulder as it cools down and dims, "You wanna surrender yet or?" he asks, believing this would be enough to make the prideful boy give up.

Krum ignores his words and throws himself to the side while casting darker curses that you'd usually expect from a student, despite still being "legal" to duel with. Reima's had enough at this point and briskly walks over to the teen while blocking all of his spells with the Staff of Manus, once he's close enough he grabs Krum by the neck and throws him to the floor, seeing he's not yet unconscious Reima kicks him in the stomach, launching him a couple meters away and finally making him unconscious.

...

There's silence for a moment before the audience bursts into cheers, surprised at how one sided the duel actually was while some of the Slytherins grit their teeth at how much money they had lost.

Flitwick "The winner of this duel is Reima Ludvig!" he shouts happily, pondering whether it would be prudent to ask him what techniques he had used.