"Infiltrated the Department of Mysteries," Snape said. "Mr. Shacklebolt, you should know very well... Barty Crouch Jr. was once a Death Eater and was even imprisoned in Azkaban for it."
Kingsley Shacklebolt frowned, studying Snape with a scrutinizing gaze. "Professor Snape, how did you discover him?"
Snape replied unhurriedly, "As Slytherin's Head of House, I had the responsibility and obligation to come here to accompany the students taking their O.W.L. examinations."
"The process was hardly interesting. To pass the time, I took a walk nearby, and during that time, I noticed something unusual."
"What kind of unusual?" Kingsley asked.
"Residual traces of magic." Snape's voice remained calm. "They were very faint, but highly unusual—something even I found somewhat familiar. In short... they were not something that should have appeared here."
Kingsley nodded slightly, but the scrutiny in his eyes did not fade.
After considering it briefly, he looked at Snape and continued, "Then why Mr. Lovegood?"
"And... where is Mr. Lovegood now? Can he testify for you and prove everything you've said?"
"That is what I was about to explain." Snape drew a deep breath. "It was him because his magical ability is exceptional... even compared with many professors."
"The situation was rather urgent at the time. I believed I had no time to notify anyone else, and Wizet happened to be there, so I told him about those traces."
"Wizet took the matter very seriously, so we followed the trail all the way and eventually entered the Department of Mysteries, where we found Barty Crouch Jr."
"As for where Wizet went..." He turned toward the Department of Mysteries. "In order to stop Barty Crouch Jr.'s actions, Wizet encountered an accident... and vanished in the Time Chamber."
"You're saying Mr. Lovegood..." Kingsley Shacklebolt's eyes widened, as though he could scarcely