The Potion on the Bones

Holding on to the mindset of "I've come this far," Vizet patiently continued to wait, until Sirius Black had fully prepared himself and entered the memory related to his escape from prison.

Sirius Black was simply too thin, thin enough that he could easily squeeze through the iron bars, then climb up to the window and jump out of Azkaban;

He crashed straight into that mass grave, smashing heavily into the ground and leaving a small pit. There was even a skeleton visible inside it.

Vizet frowned slightly. He noticed that Sirius Black was biting down on a glass bottle, which still held a murky liquid inside. It was probably some kind of potion.

With that bottle of potion between his teeth, Sirius Black leveled out the pit he had made, then plunged headfirst into the seawater.

Vizet was still extremely concerned about that bottle of potion;

He followed Sirius Black across the sea. During the journey, when a great wave came crashing in, Sirius Black was slapped underwater by it, and in order to save himself, he had no choice but to let go of the potion he was biting.

"Looks like that's as far as it goes..."

Once the memory search reached this point, Sirius Black finally returned to shore, and Vizet knew he should leave;

After that came Sirius Black's memories of evading the Dementors' manhunt and doing everything he could to reach Hogwarts.

After feeling the tip of the Wand move away from his temple, Sirius Black asked, "Well? Did you find anything?"

"Nothing much." Vizet gently flicked his Wand, drawing back the Silver Thread on it.

"Those Death Eaters looked..." he tried to describe it, "aside from their mental state being very... inexplicable, there wasn't anything strange about them."

"Oh! You mean them reciting