Azazel was relieved that it was time to kill Dean. He had lived in fear of him for a while. He remembered his first meeting with him 10 years before Sam was born. He said that he had killed him. Well, it turned out that that was just typical Dean bluff. He would use the Colt's last bullet, thus forever ending its threat. He lifted up the gun and then felt himself being grabbed by a spirit from behind. He was yanked from his meat suit. He spun around. John Winchester. He should have known. He threw John off of him and slipped back into his body. Then he heard a loud click. It was the Colt. He felt the bullet enter his body. Guess Dean had been telling the truth. At least he had fulfilled his part of the plan.
SSS
John had felt fresh air for the first time in close to a century. He saw other demons and ghosts running to its source and he joined them.
He ran out a door. He saw two people trying to close the doors. He didn't blame them. If he were human and the doors of Hell were opened, he would be doing the same thing. But he couldn't help but be selfishly glad that they hadn't been successful yet. He then noticed that it was Bobby and Ellen. He looked around to see if there was anyone else he knew.
He saw Dean sitting against a headstone and Sam standing against a tree. Obviously they were being held there. That's when he saw him. The yellow-eyed demon. Yellow Eyes was going to kill Dean. Well, not if he could help it.
He tackled his old foe and forced him out of his body. The demon was too strong for him. He knew he would be. He watched helplessly as the demon re-entered his body. Then he heard a click. Dean pulled the trigger and killed that useless demon.
John had never been so proud. He wished he had told Dean how proud he was of him on more than that one occasion.
He walked up to Dean and put his hand on his shoulder. He smiled at him. He wanted to speak. He had so much to say. But, he didn't know where to start.
Then he looked behind Dean and saw Sam. He smiled at him, too, and Sam gave him a nod in recognition. He hoped that Sam knew that he knew that Sam didn't hate him. He had figured since Sam had tried to pick a fight with him right before he died, the guilt would have been weighing on him.
Dean killing the yellow-eyed demon meant Sam was saved. As soon as that thought entered his head, he saw a bright light. His work was done. With one last look at his boys, he stepped into it.