Author note: Brief violent scenes ahead
"Forward," Yaxley ordered his captive. Under his imperius charm, the woman obeyed, stepping into the dark tunnel first.
Corban Yaxley followed behind, casting lumos as he did so. He no worry that the woman would be able to break free from the charm. She was merely a disgusting, ape-like muggle. Whereas he was a master of the imperius curse. Yaxley considered himself to be second only to Lord Voldemort himself at casting imperio. It was his specialty. So, it was a surprise that Voldemort had sent him on this mission, which seemed like it would require an entirely different set of skills to the manipulaton that Yaxley practiced. Still, Yaxley felt honored that Voldemort had such faith in him. And felt that he deserved such faith. He was his most loyal servant, after all. While all the other Death Eaters, including Malfoy, wriggled out of Azkaban by claiming Voldemort put them under the imperius curse, Yaxley's deceit was such that he had never even been suspected of being a Death Eater.
There was a shimmering barrier in front of them. Yaxley knew what it needed. It needed blood. Even though the barrier didn't look solid, he knew it would have the consistency of a brick wall until it recieved its blood payment. If he tried to get through it too many times, he would die.
Yaxley relieved his imperio charm a little—just enough so that the mindless zombie was aware. Aware of what was happening, but unable to stop it—a small touch of cruelty on his part.
"Smash your head into the wall," Yaxley said to his captive.
She whimpered, tears pouring down her face as she obeyed—one-two-three times, until her face was a scarlet mass. Each time she cried out in pain.
"Enough," he said. "Now wipe the blood on the barrier."
She did as she was told, sobbing openly and whimpering in fear and pain. The barrier vanished and they continued down the corridor.
"Silencio!" he said—the woman's crying annoying him. She sobbed silently now. There was a room at the end of the corridor, illuminated by some dancing light. When they approached, Yaxley could see the light came from a roaring fire. Lucius had told him what to do—this required the ultimate sacrifice. He required death.
"Throw yourself into the flame," he said, carelessly.
The woman, wide eyed with fear, her mouth moving soundlessly took a few steps forward and hurled herself into the fiery pit.
Yaxley watched her as she writhed in agony as the fire consumed her. He didn't care. She was nothing—just a worthless muggle. They all needed to suffer the same fate.
Once she had died, the fires faded, revealing a black doorway beyond. Yaxley raised his wand and stepped forward, kicking the charred body of the woman away from him as he did so.
Author note:
Just to address a few comments about Neville's use of accio on the egg. All will be revealed ;) There is a chapter I have written where his use of accio is going to be revealed and how it managed to work.