"What's this Noble and Ancient House rubbish if not pureblood supremacy?"
Lord Potter laughed.
"I see. You truly are as ignorant as I have expected – Dumbledore has seen to that, no doubt."
"What?" Harry asked, more surprised by the change of the detainee's demeanor than by his accusation towards the late Headmaster.
His interlocutor sighed.
"Do I really have to fill my speech with profanities for you to understand me? Well, no matter. I'm sure Mrs. Weasley – congratulations, by the way – will explain whatever you won't understand."
Hermione looked like she was about to say something, but Lord Potter's next words cut her off.
"My title has nothing to do with pureblood supremacy – indeed, to insist otherwise would be as absurd as claiming that muggle peerage system is the same thing as racism. Having Lords and Ladies of Magic is a thousand years old tradition of our world, and if you believe it to be "rubbish" – well, you only have your own lack of education to blame."
"Now listen –" Harry began to say, but his counterpart continued, as if not noticing the interruption:
"What does constitute blood supremacy is claiming that I – a Lord of Magic at the age of sixteen – am lower than some inbred halfwit just because my mother was a Muggleborn, and that my heirs will be lower than that halfwit's offspring just because the present Lady Potter also happens to be Muggleborn."
He spared Hermione one look, and to Harry's surprise, his friend's cheeks had a slight blush on them.
"It is true," Lord Potter continued, "that there are some among the Magical aristocracy that do still believe such nonsense. Most prominently, the Malfoy family held such beliefs… when it existed, I mean. Speaking of which…"
He leaned towards Harry, his green eyes meeting the Auror's own.
"Tell me, Auror Potter," He asked quietly, his tone stressing Harry's own title. "What fate has befallen the Malfoys in your… continuity? Are they dead? Imprisoned in Azkaban?"
"Well, neither," – Harry answered, feeling disconcerted for some reason. "Narcissa Malfoy saved my life during the Battle of Hogwarts, and…"
"I see" Lord Potter said in the same quiet voice. "Saved by a Malfoy, no less… Yes, I think I have learned everything I wanted here."
"Learned?" Hermione asked.
He nodded.
"That was my true intention from the start. I wished to know what my life would be like had I not broken free from Dumbledore's control. And, well…"
He smiled slightly.
"My House in ruins, its legacy forgotten… my enemies alive and prospering… the woman that was to become Lady Potter married to a Weasley… and myself as a Ministry's lapdog. Yes, this is exactly what I expected."
"You'll regret that," Harry growled, pulling out his wand. But before he could point it towards his doppelganger, Lord Potter made a quick gesture with his right hand.
A bright light made Harry squint. It came from what seemed to be a gash in the wall of the cell – and the Auror could have sworn the gash wasn't there the second before.
"What in Merlin's name did you do?" He asked, as his counterpart turned towards the light.
The detainee turned his head towards Harry, smiling slightly once again.
"They don't call me a Lord of Magic for nothing… boy."
And with that, he walked into the light and was gone from Harry's world.