Jake foils the Kennedy assassination but at what cost?
Its all come down to this.
He and Sadie are armed with historical details (i.e.

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Time is malleable now, and anything can happen.
This makes the appearance of visions (Frank Dunning, Johnny Clayton) even freakier.
Time is out of joint.
Oswald is already in position.
They will remember your name, he tells himself.
Oswald gets off his first shot (and misses) just as Jake and Sadie burst in.
He turns to shoot them.
Once again, he misses and loses his opportunity the Kennedy motorcade gets safely away.
Oswald tells Jake he came here to do something important sounding not unlike Jake himself with his mission.
Jake grabs the rifle and shoots Oswald dead but not in time to save Sadie.
She was shot in the crossfire.
Jake wants to run and get help, but she tells him to stay with her.
Police burst in and arrest Jake.
He screams at them to help Sadie, but its too late.
Kennedy is safe but at a great cost.
Plus, theres that little matter of the presidents mistresses.
Pay attention in history class, kids!
This only makes Hosty more determined to pin the crime on Jake, but then a call comes through.
Its the president himself, calling to thank Jake for saving his life.
Hosty is weirded out by Jake but promises he wont tear down this image of an American hero.
God knows the country wants a hero, he tells Jake in full ending-of-The Dark Knightfashion.
He asks Jake for his theory on why Oswald wanted to kill Kennedy.
No one will ever know, Jake responds.
Thats true Oswald is still a historical enigma.
But then she disappears, like all the others.
Jake returns to Lisbon and goes back to the rabbit hole to see what hes wrought.
NEXT: How it changed
When Jake comes out of the rabbit hole, the light has changed.
Als diner is gone just a pile of rubble now.
Yep Jake changed history and came back to a post-apocalyptic world.
Its A Sound of Thunder all over again.
Harry takes Jake to the damp, underground lair he calls home.
Jake quizzes him about the history of this new timeline.
Apparently Kennedy was president for two terms, succeeded by Alabama segregationist George Wallace.
Kennedys greatest impact, however, apparently came after he was president.
Bad things happened there, Harry says.
Obviously, Jake decides, he he needs to reset the timeline.
He re-enters the rabbit hole and comes out in 1960.
Except this time, Jake notices something Sadie was in that car!
They didnt miss each other in Lisbon after all.
Running after the car, Jake follows Sadie into the diner.
Hes soaked and bedraggled from theMad Maxfuture but still approaches her, saying they know each other.
Before he can get much farther, the Yellow Card Man appears at the window.
Jake goes out to confront him.
Jake insists that falling in love with Sadie is his true mission in the past.
He wont even bother saving Kennedy this time!
But the Yellow Card Man doesnt change his tune.
Sadie comes up to talk to Jake, but this time he listens to the Yellow Card Mans warning.
He tells Sadie he made a mistake and lets her go.
He returns to the rabbit hole this time, everything is back to normal.
Jake, though, is a bit traumatized by his experiences.
His students can see somethings wrong.
Im sorry I didnt help you, he tells Harry.
Harry comforts him, and tells him hes a good man.
This is the real scale of heroism micro, not macro.
Not by throwing all of history into flux in service of a theory.
Jake finally Googles Sadie to see what shes up to.
Jake zips down, and watches an elder Sadie give her acceptance speech.
But because we are here, let us dance.
Jake approaches Sadie afterward and asks for a dance.
He asks if shes had a happy life, and though she admits struggles, she says she has.
Shes a little startled by Jake but also charmed.