Sam walked down the steps of the motel, he wanted food so badly that he felt faint, they had just been on a 'hunt' and Sam needed some energy. Before he knew it the floor felt like it had given way below him and he fell for what seemed like an eternity before he blacked out.
"Hey buddy, what happened, you just passed out man, are you alright, you fell a long way"
Sam came round to find himself at the bottom of a set of stairs. He looked around at him and tried to figure out where he was, but then a jolt of pain hit as he tried to move he suddenly became aware fully of the damage the fall had done.
"Dean?" Said Sam looking up at the man standing over him.
"No, I'm Jack, I saw you fall" Jack was a tall slim man in his early twenties, his walk was so much like Dean's as was his physical appearance, it had all summed up to make Sam, in his dazed state, mistake Jack for his brother.
Sam moved his shoulder and it gave him an incredible amount of pain, Jack told him to stay still, considering he was a stranger Jack had a strangely calming effect about him.

"I want my brother, he's in room forty-five" Uttered Sam.
"First, what's your name?" Asked Jack.
"Sam"
Jack ran upstairs and knocked on the door of room forty-five.

"Who the hell are you? You're not Sam" Said Dean when he opened the door and was greeted by this new stranger that just entered Sam's life.

"I know that. I'm Jack, you have to come with me, your brother has had a bit of an accident"

"Did you hurt my little brother?" Asked Dean suspiciously.

Jack noticed Dean's hand travel to his waist where he no doubt was concealing a weapon.

"He fell down the stairs; can't a stranger just be concerned?"

Dean looked him up and down. Jack felt he was being read and almost vetted. Finally Dean looked him in the eyes and decided to follow Jack down the stairs to where Sam was.
"Sam, you Ok?" Asked Dean, he crouched down to the floor next to Sam.

"I fell down…the…stairs" he said, Sam was trying to stifle the pain but it was extremely difficult.

"Can you help me to the hospital with him?" Dean asked Jack

"Anything to help" replied Jack

Between them, Dean and their new found acquaintance helped Sam into the car. While Dean drove as carefully as he could Jack sat in the back of the car with Sam as if he had known him forever.

"Which of you is Sam's next of kin?" asked the doctor.

"That'd be me, I'm his older brother"
"Alright. It would seem Sam had a quite a fall, but luckily there is no permanent damage; he dislocated his right shoulder and has a moderate degree of concussion. If its ok we'd like to keep him in for a while to keep an eye on him"
"I suppose so" Said Dean to the doctor.

Dean grinned at Jack standing next to him.
"I can't believe he fell down the stairs!"
Jack looked over Dean's shoulder as he signed a form.
"You're surname's Winchester?"

"Yeah, why?" asked Dean, mystified at the randomness of the question.
Jack regretted asking, but it just came out in the excitement, he was standing next to Dean Winchester!
"We need to talk. Alone" said Jack.

"O.k. calm down, dude" said Dean, so far he liked Jack but he had just begun acting decidedly odd.
"This is so huge, I…I…I just don't know where to start." Continued Jack.