I want to re-read the section where John sees Sammy the Weapon for the first time (I think). Sammy gets mad, uses his power to throw John against the wall, holding John up and hurting him, twisting his joints (I think). Dean distracts Sammy, and convinces Sammy to let John go.

Do you know which chapter this is in?

It's one of my favorite visuals, big, dangerous Sammy, nuzzling Dean.