Don't give into hate Hermione. It'll destroy you.

It was similar advice that Hermione had given Harry when he wanted to destroy Voldemort. Harry could have given into hate, but he would have become a monster himself. Hate is a powerful thing that can ruin a person, even someone as pure as Hermione. He had taken the advice and resisted. So when Hermione cried on Harry's shoulder, he returned the favor. Hermione kept repeating it over and over, that she wanted to kill Walter White. She wanted to destroy him. Hearing any advice against it had angered her further and she ran out of the common room and into the corridors of Hogwarts. They didn't see her again.

Hermione could not be found. No charm or spell would help them. They suspected she had covered her tracks. They quickly turned to desperation and were willing to try anything. So when Professor Trelawney, their least favorite professor of their least favorite subject offered to help, they accepted. They thought of the woman as a quack who believed too strongly in divination. So when she passed them a crystal ball, they thought no differently. However, the ball glowed to life in Ron's hands and revealed the image of Hermione in a very futuristic city-scape. One that could not possibly exist today, and she seemed to be the exact same age as when she left. The future?

Harry and Ron sprung to action, convincing a reluctant Dumbledore to lend them a time-turner. They went forward 20 years. 30 years. 50 years. The landscape never matched the one in the crystal and they grew perplexed. Walter White still had to be alive, they could see in the crystal that Hermione was still pursuing him. But nothing about it all made sense.

Three months later, Harry and Ron went back to Trelawney and demand an explanation for the crystal. As they placed the crystal in her hands, her eyes went milky white and she stayed frozen for seconds. When she awoke, she looked straight at them and said,

"She is somewhere else."

Professor Trelawney continued to explain that she was in another world, another dimension that was like our own. We all had a double there and the properties of the world were the same. But still, our doubles were different, separate people. There, Hermione was working with a team called Fringe. There she was plotting to kill the wrong Walter White.