I apologize if this has been mentioned, but I haven’t read it anywhere: after the ceremony scene Commander Lawrence is no longer wearing his scarf. Of course in real life it would be strange to have it on after such an encounter. But in the world of “The Handmaid’s Tale” I believe this is the first time we see him without it. In interviews Bradley Whitford has mentioned how compelling he found the costume fitting for this character. I believe it’s meant to signify that Lawrence feels there’s no longer any reason to protect himself (“save his neck”). Because his worst nightmare has come true: he’s broken his promise to his wife, hurt her irreparably, and permanently damaged their love.
Of course from Eleanor’s perspective he became another person and ruined their life as soon as he created and implemented the atrocities of Gilead. But just because he’s brilliant doesn’t mean he’s wise.