Confused about Walter's actions (SPOILERS)
Just saw this movie, and really enjoyed it, except for several scenes which was confusing (in terms of motive):
1. Why did Walter, despite also having a gun, bolt when he was in his standoff with Jake? Why did he forfeit his deal with Jonah by giving Jake his cell phone? He could've killed Jake with his gun, taken Sara alive, taken the money from his deal with Jonah, too. Instead, he just decided to run (after all that work). He also just randomly decided to give Jake all the money?
2. Why did Trevor also suddenly change his mind? "Too many murders" or something, which doesn't make logical sense because HE was the murderer? (If he had an issue with killing people, why do it obediently for two decades and suddenly have an issue with it?)
3. What happened to Sara that she had a kidney removed? (For example, did this happen super quick while she was under when taken hostage by Walter? Or did Jake decide to take her kidney and sell it?)