The thing that really broke my heart was the moment right after Crowley left and Sam was looking frantically in literally every crevice of that room trying to find Dean, to know that everything was okay, to the point where he was on the verge of tears, looking like a lost child trying to find his big brother who always made him feel safe.
But Dean wasn’t there.
it’s like the scene where Lucifer just took control of Sam’s body and Dean looking totally helpless….. Now it’s Sam’s turn to feel it. ):