"Good." Sam had always felt guilt where Adam was concerned. Guilt that they hadn't known about him, hadn't been there for him, hadn't been there to prepare him or help him fight the ghouls that took his life, and his mother's life, way too early. Hadn't been there to educate him about the world they lived in, and the things that might come after him.
Guilt that while Sam was pulled out of hell, and his soul was retrieved separately, all the while Adam was left to rot in the pit with Michael and Lucifer. He carried a lot of guilt over that, even though none of it had been his choice, and none of it was the choice he would have made. He was grateful he'd been pulled out, certainly. He was glad Dean managed to get his soul back. But not at the expense of leaving Adam in there.
"This is a good start." A friendly game of pool. Sam could be competitive but he was more interested in bonding with Adam than winning a game.