Fighter: Dean Winchester (REVAMPED VERSION)

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Nadia was startled awake by the violent pounding on her motel room door. Her heart raced, and she rubbed her eyes, blinking against the haze of sleep. The clock on the nightstand glared back at her: the middle of the night. She and the boys had only arrived in Haleyville, Kansas, hours ago, barely enough time to settle in.

The knocking didn't stop, growing more insistent. Groaning, she dragged herself out of bed, trying to shake off the exhaustion that still clung to her. She had planned to take a shower before crashing but had ended up falling asleep fully dressed—boots and all.

"I'm coming," she mumbled, her voice thick with sleep.

She yanked open the door to find Dean standing there, his face tight with tension and anger. His eyes scanned the room before locking onto her.

"Have you seen Sam?" Dean asked, his tone sharp and impatient. He stepped inside without waiting for an invitation, his gaze flicking around as if he was searching for something—someone.

"No," Nadia replied, her brow furrowing. "Has he gone off again?"

Dean grimaced, his lips pulling into a tight line. "I need you to come with me."

"What's wrong?" Nadia's voice was small now, anxiety creeping into her gut. She studied his face, her instincts telling her something was off—something was wrong. "Where are we going?"

"To find Sam," Dean said flatly, his words clipped.

"Where—"

"I'll explain in the car," Dean interjected curtly, already turning on his heel and striding toward the door.

Nadia sighed, frustration mixing with her concern. She grabbed her jacket off the back of a chair and hurried after him. 

Here's the revision with added details, while keeping the original dialogue intact:

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It turned out that Castiel had taken Dean to the past, to a time before he was even born. Dean had met his parents and discovered that his mother, Mary, had been a hunter—her parents too. She'd made a deal with the yellow-eyed demon to save their father, John.

But what Mary hadn't known was the full extent of the deal. That saving John's life meant Sam would become one of the yellow-eyed demon's "children."

Years later, she had found the demon in Sam's room, feeding him blood, and it had cost her her life.

It was a lot for Nadia to take in. She'd been through some crazy things in her time, but the Winchesters? They took the cake.

According to Castiel, Sam needed to be stopped. But from doing what? That was what they were about to find out, thanks to the angel giving Dean the address to Sam's whereabouts.

Dean drove down the dark road like a criminal in a high-speed chase, tires screeching as they rounded corners. He pulled into the parking lot of a secluded warehouse, parking next to an unfamiliar car, the engine still running.

"I still don't get it," Nadia said, catching up with Dean as he strode toward the building.

"What?" Dean didn't slow his pace, his jaw clenched.

"It's Sam," she said, her voice uncertain. "I haven't known him for that long, but he doesn't exactly come off as a threat. Castiel said he was dangerous. I don't mean to question his angelic wisdom or whatever, but 'dangerous' is a bit much, don't you think? I mean... it's Sam. How—"

"Shh." Dean motioned for her to stay quiet as he pulled her down behind a window, his eyes focused on the scene inside.

Sam was in the middle of interrogating a man, the guy tied to a chair in the center of a Devil's Trap. Nadia could see the man's fear, but it was nothing compared to the expression on Sam's face.