Sometimes Kate feels like she's going stir crazy.
Sawyer's sick and she spends her time at the hatch nursing him. He's delirious and he rambles a little bit and it's hard to make sense of what he's saying.
After she's been with him for 48 hours straight with very little sleep, Sawyer grabs her arms while she's leaning over him.
"Why did you kill me?" he mutters loudly, sounding aggressive.
Kate starts to panic and drops the food bowl onto the floor, and runs out of the hatch as fast as she can.
She's wandering in the jungle and finally settles in a quiet spot where it feels like she is finally safe.
Around twenty minutes later Jack turns up.
"I found Sawyer lying on the floor, and the button about to go off," he tells her, angrily.
"I'm sorry," Kate says, feeling bad that she was the cause of that.
"Are you?" Jack challenges back.
This riles Kate up. "Yes. I'm sorry that I'm not as good as you, I'm not as perfect as you," she replies loudly, walking towards him feeling angry and despairing.
Then she turns away from him, about to walk away.
Jack pulls at her wrist, and then grabs her whole body in an attempt to stop her from leaving.
Kate whimpers and tries to pull away from him, then struggles against him.
Eventually she stills and focuses on his face, while he looks back at her trying to calm and reassure her.
"Everything just feels really crazy right now," Kate says.
"I know," Jack replies back in his most soothing voice.
She stares into his big brown eyes and there's something about the sympathy in them that makes her impulsively lean forward and kiss him.
He kisses her back, and she places her hands on either side of his face tenderly.
It only dawns on her after a few moments that this is wrong.
She is broken and Jack can't fix her. He's too good for her, and she will only damage him.
She breaks away from him, then runs, only turning back to give him a confused stare.
Later that day, Jack catches up with her at the beach, and he has questions she doesn't want to answer.
"Kate, I know you're going through a tough time right now, but I need to know what's going on with you."
He continues. "Why did you leave Sawyer alone like that? Why did you run away from me in the jungle?"
Kate feels uncomfortable and suddenly small.
"Sawyer reminded me of someone from my past. Something I wanted to forget," she says.
She's avoiding his question about the jungle because she doesn't know herself why she kissed Jack in the first place.
Jack takes a minute to process her reply, and puts it together with one of their earlier discussions when they were fighting over the marshal's suitcase.
"Did he remind you of the man you loved?" he prompts.
A fresh thought occurs to him. "Is he the father of your baby?"
Kate shakes her head. "No. He reminded me of someone who was a bad man. The man I loved was a good man," she sounds defensive of his memory.
Jack's still puzzled over this. "Does the father know about your being pregnant?"
Kate lifts her shoulders then sighs heavily. "Jack it's not like that. He was a bad person who never cared about me, and he's dead anyway."
"Did he die in the plane crash? Jack perserveres.
Kate takes a moment to process this. "I guess you could say that."
Jack's confused by her reply to a straight forward question - either you die in a plane crash or you don't, there's no in between there.
Kate's face is starting to crumple a little and she rubs her hand across her eyes and starts to walk away.
Jack catches up with her and puts a hand around her arm.
"Kate, you ok?"
Kate struggles to pull together a smile for him. "Yep," she replies, "I'm fine."
She turns to go and Jack watches her doubtfully as she moves off towards her tent.
Jack's been puzzling over a couple of things since the day Kate kissed him and their discussion afterwards.
Firstly he doesn't know what it means that she decided to kiss him in the midst of what seems like a mini breakdown. He is reminded of his patient's daughter Gabriella who kissed him after her father died on his operating table. Women can be so unpredictable under pressure, he thinks.
Secondly, he's confused by what Kate said about who the father of her baby is, because it doesn't make sense to him.
Eventually later that day, an idea comes to him, and he rejects it at first because it can't be right - surely?
But the longer it sits with him, the more convinced he becomes because it is the only explanation that makes sense of what she has said.
He's thought about Sayid, or Boon or Charlie as possible fathers. Hell he's even considered John Locke - but rejected that as too bizzare.
He knows that before Kate was on the island she spent three months in Australia on a remote farm where only she and a retired widower worked the farm, before being apprehended by US Marshal Edward Mars.
He's thought about some things from the first week on the island which felt a little off at the time, but now ring alarm bells.
He remembers the way the Marshal looked at Kate, the way he spoke about Kate. He remembers him asking him if Kate got to him too. The way he grabbed her in the tent.
That some of the passengers told him they didn't know he was a Marshal and thought Kate was the man's girlfriend and they found it weird how possessive and controlling he was of her. How they thought it stemmed from the anxieties of a man twenty years older than his pretty girlfriend that she might play the field.
There was more than a law enforcement official escorting a prisoner to his interactions with Kate. There was an intensity of feeling which didn't belong in that relationship. It was out of place.
And the Marshal was the only person who "sort of" died in the plane crash, having been injured in the crash and dying several days later. And he certainly never cared about Kate - only pursuing her and capturing her.
Jack needs to know one way or the other if he is right.
The next day Kate is on hatch duty with him.
They pass away the first hour talking about nothing much - their favourite records in the collection and checking on Sawyer who's still unconscious but improving, and Jack decides it's time to ask.
"Kate, when you said I guess you could say that the father of your baby died in the plane crash, did you mean that Marshal?" he questions.
Kate looks genuinely shocked by his question. Somehow he's managed to piece together her dismissive reply to his questions into a theory that makes her stomach turn.
Kate doesn't reply, and looks away from him.
"Kate?" Jack prompts, quietly.
Kate gets up and walks to the window, but still doesn't reply.
Jack follows her and puts an arm on hers, then turns her around.
She hasn't answered his question and tears are starting to trickle down his face.
Jack sighs and he's looking at her face closely. "He raped you didn't he, the marshal?"
Kate still doesn't reply, but her face says it all. The hurt is written all over it.
It's confirmation enough for Jack. He pulls Kate into his chest and wraps his arms around, while his throat constricts. He has an urge to hold onto her so tight he'll never let go.
"He can't hurt you anymore. And I'm glad I killed him now," he says harshly.