In this story the battle takes place at the beginning of their 6th year, Dumbledore is already dead, and they don't know that Snape is a good guy.
I really hope you like it, even if you don't please leave a review to tell me what you think – constructive criticism is welcome.
The Beginning
The battle was practically over at Hogwarts, and Voldemort had won. In the middle of the great hall was Harry's motionless body, his eyes lifeless. The order had not given up, but Hermione noticed that their numbers were dwindling fast.
She lifted her head slightly, the dead bodies surrounding her acting as a shield from the last fights going on, and was disgusted to see Voldemort sitting in Dumbledore's chair watching the battle with sick interest. Soon she would get up and fight, but she had to rest for at least a few moments first. Her body was tired from being hit with the cruciatus curse and she was surprised that she was even alive, perhaps the death eaters had made a mistake? The thought made her smile and then she laughed quietly, until she realised she was actually crying. It suddenly dawned upon her that she was going to die, and she quickly decided that if these were her last moments then she should use them wisely.
Hermione saw the doors of the Great Hall open and somebody walk in. When she realised who it was she was filled with a rage so huge it felt like her entire body was burning. All she wanted now was revenge, revenge for Harry and Ron and for anybody else she loved that Voldemort had taken away. If these were her last moments, then she would use them to kill Severus Snape.
Hermione crawled her way through the dead bodies, ducking behind them so that none of the other death eaters would see her. It would not do for her to become involved in duel with one of them. When she was close enough, she stood up and advanced towards Snape, her wand at the ready.
"Snape!" She said loudly. And he turned around. When he saw her he looked surprised and… relieved? He took a step towards her and she quickly raised her wand. He continued to walk towards her and she threw a curse at him, which he deflected easily. But he didn't try to retaliate.
"Fight me you bastard!" She spat out, shooting another curse his way. Again he deflected it. He was only a metre away from her now.
"Don't be stupid, girl." He hissed. "Shut up and listen to me."
"Why would I listen to you? You're a slimy traitorous git!" She replied. But she didn't send anymore spells his way. Something about his expression made her stop.
He came close to her and started whispering hurriedly. "You have to stop this from happening, okay? You have to change it. Make sure they don't die. I don't care how much else you change, but make sure they don't die." Hermione was very confused, but by now the death eaters were looking at them and they had Voldemort's attention.
Snape lifted his wand and Hermione quickly stepped back and raised her own, but before she had time to protect herself Snape had loudly shouted a spell that she didn't know. Hermione was thrown into the air and, for a second, everything went black.
The Great Hall was filled with laughter as breakfast took place. Sirius sat with James, Remus and Peter at the Gryffindor table, and they were currently whispering to each other about a plot they had come up with to annoy Snivellus. James was grinning widely, Peter giggling nervously and even Remus, who was usually quite withdrawn about taking part in their plans, was smiling and giving them advice on how improve the effectiveness of their new prank. This was good, because they always seemed to work better when Moony, who was the most sensible of them all, gave his input.
There was suddenly a flash of green light that put an end to their conversation. Sirius was surprised to see that, seemingly from out of nowhere, a girl covered in blood and scars materialised above them. She stayed in the air for only a second, before falling to the table in front of them. He heard a commotion around him as many teachers and students stood up to see what was happening, but that didn't matter – because at that moment, she turned her head, opened her eyes, and stared at him.