You reach out with one hand and move a chunk of stone from a parapet into the air between you and the helicopter. Then you send it hurtling towards the helicopter.
The lone figure stops and gestures for more people to enter the helicopter before he does. Two more figures run past and into the helicopter, just as the stone chunk collides. By a stroke of luck it flies between rotor blades and - following a loud crunch - it disintegrates the motor assembly. The helicopter goes haywire. It wobbles and topples off the tower-top, sending screaming pilots and passengers to their doom.

The now lonely figure throws a curse into the air at you.

Wait, where are your bodyguards? You need bodyguards.
"Krouts! Two of you, to me!"
Two men race across the wall to you.
"Get in!" You point at the helicopter.

They obey like good minions and scramble inside. The rotors have sped up now and ready to take off.

You stop for just a moment, wondering if you forgot something, and hear a high-pitched whistle as a projectile speeds overhead and slams into the helicopter's rotor motor.
There is an explosion of metal shrapnel as the rotor assembly breaks apart like a grenade. You drop to one knee and duck your head as a rotor blade section whizzes past your ear.
You silently watch as the helicopter tumbles from the tower - then look up. Floating high in the air is what has to be your new Arch Nemisis - in a business suit and mask, floating on a disk.

You throw curses at him and crank your PKM's charging handle back and forth. It is ON!

Komrade Kurt spouts some mockery and gibberish and meaningless words you don't care about. You roll your eyes as you float high above him in the air on your little metal pedestal.
Then he opens fire.
You duck and dodge, avoiding some bullets and halting others before your hand. Komrade Kurt pauses and lets out a roar of frustration as a number of Krouts come to his side. So you throw his bullets back at them.
He kicks up a piece of debris with his boot, catches it in one hand and deflects the bullets you threw at him. He laughs and throws the metal like a frizbee at you and they all open fire.

You easily stop it before it gets near you. No biggie. But the massive amounts of bullets is just too much for you right now. You are forced to weave in and out of the hellfire, bullets missing you by a hair. A number of them hit the hubcap, however, making for a turbulent ride. You wobble slightly and into the path of just one and catch it in your left shoulder.

"So now you decide to show yourself? Hah! You will meet same fate as Hipshot! Krouts! Otkrytʹ ogonʹ!"
You let rip. The crashing of hammer on cartridge is deafening and the recoil is extreme. But you take it like a man and keep firing. Blat blat blat

This Superhero is bulletproof! You can't seem to hit him! You unleash a roar of frustration as your Krouts come to your aid. The Hero, of course, takes this moment to fling your bullets back at you. Ha! You don't take second-hand goods.

You take a step and stomp on a piece of metal flung from the chopper wreck and catch it like a pro baseballer on your arm. The bullets ping off harmlessly, but a few manage to hit your comrades. Now you're pissed.

You fling the metal sheet like a disc at the Hero and your men start firing. Your projectile flies true - until it stops dead and drops like a stone. But the bullets are already flying beside and the Hero can't catch them all, so he dodges around and under and over. Maybe your men are a good shot, or maybe the Hero is a bad surfboarder, but in any case a few bullets strike his 'board' and he wobbles, then grabs his shoulder in obvious pain.

Success! Direct hit!

You reach out with both hands and take 'hold' of all the Krouts, then smash them together and fling them off the tower in two separate directions. They scream as they fall - like sissy men - and crunch as they hit the ground.

You then speed down to the wreck and rip a rotor blade from it. Looks properly sharp too.

Just as your magazine runs dry, the Hero gestures and your Krouts smash together like a bunch of bowling balls, then they are sent flying off the tower in two directions. You close your eyes and duck your head as you hear them scream. When they stop, you wait another moment with your head bowed. They you look up and flash your eyes open - pure, flaming hatred burns within. You reload your gun without shifting your stare at the Hero. You then lift your gun up to fire and the Hero drops from the air. You don't have a target.

You glance around quickly, making sure he hasn't snuck up on you. Nope. Where'd he go?

You speed back up the castle wall with your deadly weapon flying along beside you. The top of the tower passes suddenly and you stop moving about 20ft from the rooftop. You make the rotor blade gently bob up and down for dramatic effect as you point a single finger at Komrade Kurt.

"This ends tonight." You threaten.
"Ha!"

Kurt pulls the charging handle back and catches the round that is ejected, then examines it closely.
"You should know ... "
He flicks the round in your direction and it clatters on the stone pavers.

"... NEVER bring a knife to a gun fight!" He finishes by throwing the gun handle forward and opening fire.

You smile, just a little, and think yourself smart. You swing the rotor blade in front of you in multiple slashing motions, blocking each bullet as it comes. There is a satisfying ting as you hit each one.

"YAAAAAAAAAAAAAAAAA!!!" Kurt yells.

Then you feel a red-hot stabbing pain in your chest at the same time as Kurt stops firing. He looks at the gun, dumbfounded.
You look at your chest, shocked, and touch a finger to the hole in the centre of your torso. Your finger comes back bloody.

Kurt looks at you and realises what he has achieved and pulls the trigger once more - only to hear the click of an empty chamber. You see that your blade now looks like metallic swiss cheese.

You both look at the lone round half-way between you on the rooftop.

You swear continuously as you look around for the bastard.
"Come back and fight like a man!" You yell.

Then he does. Like a bolt of lightning he flashes from the edge of the tower-top to 20ft in the air where he stops and looks at you. There is a razor-sharp rotor blade floating beside him menacingly.

"This ends tonight." He says to you.
"Ha!" You guffaw, pulling the charging handle of the machine gun back. A round pops out and you catch it.

"You should know ... " You toss the round away and it clatters on the stone.

"... NEVER bring a knife to a gun fight!" You force the gun handle forward and lock the trigger back. Bullets fly.

The rotor blade swings back and forth, blocking every one of your shots.
"YAAAAAAAAAAAAAAAAA!!!"

Then you hit empty. You stare at your gun. How can it fail you, right now when you are so close? You look up at the Hero, who is touching his chest gingerly, his weapon little more than a mass of holes surrounded by thin metal.

Wait, you hit him?

You pull the trigger again, only to reminded that you are still empty. You almost reach for your sidearm - then you spot your discarded, perfectly usable PKM round sitting there on the stone about 10ft away.