It was breaking her. The force was mind-numbingly painful, and somehow the pain continued to increase until it felt impossible that she wasn't dying from it. Hermione was writhing as she sought to get away — to escape the invasion. Screaming surrounded her and just kept going on, and on, and on.
Finally Voldemort withdrew from her mind. Furious. She slowly became aware that the screams had been hers. By then, they had been reduced to tiny mewling wails of pain past shredded vocal chords. Guttural sobs that kept choking out as her chest kept spasming from pain, and she struggled to breathe.
“I do not like secrets kept from me. With Potter dead there should be nothing left to conceal. What are you hiding?” Voldemort hissed. His bony fingers seized her face and turned it so that she met his eyes.
“I — don't — know—,“ she said. Her voice was rasping and broken, and she weakly tried to pull her jaw free from his hold.
“Call Severus! And the Warden. She shall be punished for this,” Voldemort said. He viciously probed Hermione's mind until she lay limp and barely conscious on the table.
Umbridge arrived first, looking appropriately terrified.
“My Lord, my Lord,” she said, dropping to the ground and crawling toward him.
“
Umbridge screamed. She screamed, and screamed, and writhed on the ground. Hermione almost felt sorry for her.
After several minutes, he finally stopped.
“Did you think, Warden, that following the letter but not the spirit of my commands would spare you?”
Umbridge only whimpered.
“I knew of your dislike for the Mudblood, but I had hoped your obedience to me would be sufficient motivation for you to restrain yourself. Perhaps you need a permanent reminder.”
“My Lord—”
“What is that punishment you're so fond of doling out among your charges? Knuckles, isn't it? Tell me, Warden, how many fingers will you have left if I take a knuckle for each month you spent trying to drive the Mudblood insane?”
“Noooooooo.” Umbridge voice rose in a shriek. She was still shaking and spasming on the ground.
“Perhaps I should be lenient,” Voldemort said, walking slowly toward her as she sniveled and grovelled at his feet. “Your work has been mostly good. Instead of sixteen, I'll halve it. Eight knuckles as a reminder I said I wanted Potter's Mudblood left
“Pleeeease...” Umbridge was pushing herself up off the ground, sobbing.
Severus Snape swept into the room.
“What's wrong? Unable to endure consequences of your own devising?” Voldemort sneered, and waved a hand as he turned away from Umbridge. “Take her away. Drop her back at her prison when you're done.”
Two Death Eaters came forward and dragged Umbridge from the room as she begged and wailed apologies.
“Severus, my faithful servant,” Voldemort said, turning toward the Potion Master. “I find myself with a puzzle on my hands.”
“My Lord,” Snape said, folding his hands respectfully in front of him and lowering his eyes.
“You remember the Mudblood, I presume.” Voldemort moved back toward Hermione, staring down at her and running a skeletal finger along his lipless mouth.
“Of course. She was an insufferable student to teach.” Snape walked over to survey Hermione, who was still strapped down on the table.
“Indeed, and a good friend of Harry Potter, the boy who died,” Voldemort said, caressing his wand lightly. “She was also a member of the Order as I'm sure you recall from your many years as my spy. When Potter died, she was captured, and I ordered her imprisoned but left intact in case I ever had need of her. Unfortunately, the warden at Hogwarts saw fit to dole out her own punishment for past offenses. She imprisoned the Mudblood all this time in a cell under sensory deprivation.”
Snape's eyes widened slightly.
Voldemort rested a hand on Snape's shoulder. “According to the mind healers, the experience enabled the Mudblood to lock away her memories. Sealing them off from herself and from me. The identities of her parents — which is of no consequence. More vitally, a great many memories from the war, particularly near the end. This memory loss occurred
“Of course, My Lord.”
Hermione found Snape's cold, bottomless eyes peering down at her. She didn't have any strength left to try resisting as he sank into her consciousness.
He didn't bother with her early memories. He went directly to the war and swept through the memories quickly but thoroughly. He seemed to have specific categories he pursued. Healing. Potion brewing. Order meetings. Research. Conversations with Harry and Ron. Fighting. The final battle. Whenever Snape came upon a locked memory, he seemed to pause and consider its surroundings before trying to break into it.