Harry watched Sirius through squinted eyes, his wand in hand and outstretched. "Black, I don't want to duel you!" he shouted from across the chamber.
Sirius scoffed, his wand raised and a patronizing smile playing at his face. "Oh, but Horntail, you see, it's not about what you want. It's about what's going to happen."
"BLACK, I DON'T WANT TO FIGHT YOU!"
Sirius raised a mocking eyebrow. "Because you're scared. I suppose I am quite intimidating. But that doesn't matter. Because, as you will soon learn, no one messes with Sirius Black's girl and gets away with it."
"SIRIUS, STOP IT! YOU DON'T KNOW WHAT THE HELL YOU'RE TALKING ABOUT! That slut came on to me, I never showed any interest! I don't want to date Alice, I swear!"
"Did you just call my girlfriend a slut?"
"Maybe I did."
"Horntail, I know dark magic. Stuff you've never seen. It runs in the family, you see. I hate to use it, but this is a special case."
"Oh, believe me Black," Harry spat. "I've seen much worse than anything you can throw at me."
"But can you handle it?"
"I think so. You see, I've had a bit of prior experience."
"Well then, let's see, shall we?"
The boys wands flew, and simultaneously jets of light flew out of them and across the room...