Such a tiny little expression, that wince. So subtle you can’t see it at all if you aren’t watching in HD. And yet it contains within it volumes. Daryl trying to keep his feelings hidden but losing that battle ever so slightly (but massively for him.)
And this tiny expression, both times we see it, because of Carol - thinking he lost her, that he was responsible for her loss, that he didn’t protect her well enough. And it’s an expression of pain that leaks through. Not anger or straight sadness but pain.
Talk about the school of subtle acting. So beautiful.