There was a part of John that was proud. Sam being so cautious, and a part of him that was hurt. He didn't voice either of course. He only stood beside Dean and reached for the knife without hesitation or fear to fail. He couldn't look at any of them when he carefully dragged the pocket knife across his arm and absolutely nothing happened. Only blood dripped down his arm and stained his skin. He hardly even winced. He could feel the pain of course, but he knew it would fade. There was nothing wrong. He had been possessed before, he knew what it was like. His eyes traveled up to Sam's face for a split second until he handed the knife off to Dean.
He would have drank a mug of rock salt and holy water if it meant he would get his family back. He would do anything it took to keep them together, this was a small price to pay for having them back in his life. He couldn't help but let his eyes trail toward his wife. Since she died all he'd seen was evil everywhere, but for the first time in so many years it felt like a brick was lifting off his shoulders. He no longer had to carry the weight of the world.
He was dumb struck for a few moments as he looked at her and remembered what she looked like before that night...it was her. It had to be. Didn't it?...His eyes leveled on both of them and he finally found words. "All of us." He stated. Knowing they would understand, It would put his mind at ease and honestly after all the years of worry and pain he wondered what that felt like, to finally be able to rest again and have his life back after so much suffering and pain.