Dikin was both right and wrong.
Harry had indeed dealt with an Australian wizard before, but it had not been Weir Hallen. It had been Meng Sies, earlier still.
But the moment Dikin said that, Harry realized he had misspoken. He did not want anyone to know he had anything to do with Meng Sies's death, even if the man had been the one to come looking for trouble.
So he immediately said, his face full of irritation, "Haven't you Australian wizards been pestering the Ministry of Magic all this time? Why are you coming after me now?"
Harry had advanced Occlumency, and as long as he paid attention, he could keep his emotions and expressions properly under control. For the moment, Dikin could see no flaw in his expression.
But Dikin had no intention of leaving it at that. He stared coldly at Harry. "Then tell me where Weir Hallen and Horton went."
"I told you right from the start. They were killed by Vol... by the Dark Lord's followers. Horton was killed by Peter Pettigrew. And Weir Hallen was killed by a Czech Dark Wizard called Dismask."
Harry had originally meant to say Voldemort.
But he remembered that, just after the holidays began, Lupin and Sirius had both specifically warned him not to say Voldemort's name outside school.
At first, Harry had wondered why Sirius and Lupin were afraid to say Voldemort's name now. After all, they had both dared to use it directly before.
Professor Lupin had explained it to him.
Voldemort had put a curse on his own name. Saying it aloud would alert him. Of course, they had also said that Harry's proficiency in Occlumency should actually keep him safe-during the Sixth Task of the Triwizard Tournament, Harry's mastery of Occlumency had astonished the professors