Before seeing the movie, I assumed this scene was at the end of the summer, when they're about to part, since we see Ennis close his eyes as if he's in a pain he can't express out loud. However, there's been some discussion elsewhere on this board about the shirts they're wearing, which seem to suggest this scene is earlier . . . . Sometimes filmmakers will place scenes out of context in a trailer to communicate an idea that the movie itself didn't actually represent at that moment. So maybe that's what they did with this (sadly) deleted scene. Hope it's included in the DVD somehow.