This is so good! Such an almost happy chapter, now that Steve really knows it isn't his fault, but there's still the specter of what did happen hanging over it all for Steve, and for the reader the extra knowledge that, no matter how far Bucky progresses in recovery with Steve here, he's going to fall off that train and get recaptured, and be retraumatized in so many ways. This is so painful, and so good.