Moon's Shadow: I will try my best to answer your questions.
First of all, when Sorrelpaw 'killed' Fernpaw, she was angry at Fernpaw for making an uncalled-for prank. When she realized that she had killed Fernpaw, she used her powers to bring her sister back to life, and Fernpaw wasn't sure what had happened, anyway.
Sorrel's power was never really directly stated for a reason: it's supposed to be at least slightly vague.
Sorrelpaw left ThunderClan because they forced her to make the choice between leaving Bouncepaw, or staying with him. Sol convinced Sorrel to stay with Bounce because if they were willing to lose her, then they should.
Hope this cleared up any confusion. Please keep in mind that some of these answers will be conveyed later in this book.
This is going to be a relatively short book, too. Probably only around ten chapters.
The plan was settled soon.
Sorrel, Bounce, and Sol headed home, satisfied that they would get revenge on the ones that had destroyed their lives. Dusk and Yarrow were waiting for the news, wondering if their parents would get justice. They were excited to hear that ThunderClan would be punished. Leaf-bare was coming, for many things.
"I really want time to move faster," meowed Bounce. He and Sorrel were hunting together, to both gather food and chat.
"I know. But do you know what they're going to do? Sol shooed me away before the conversation with Susan and Jacques was quite finished."
Bounce shrugged. "No clue. Sol's always been friendly to us, though. It's not like him."
"I know. He's never done that to me."
"Whatever." Bounce immediately dropped into a crouch after his comment and followed after a creature that Sorrel couldn't see.
Sorry for the super short chapter. It's just... what else is there to put?
BTW, Merry Christmas everyone! :)