Dean’s feelings
Still not over the fact that Sam said “Cas dinged you up pretty good” and apparently Dean translated that as “Cas broke your fucking heart, wanna talk about it?” Dean, honey, I’m pretty sure that Sam was thinking more about how Cas literally almost beat you to death, and wouldn’t have even brought emotions up if you hadn’t.
The thing is, Dean Repression Winchester actually thought about it for a second. That’s how much his feelings were dinged up.
And maybe Sam wasn’t talking bout the physical injuries – Cas healed Dean’s body completely. Sam may have never even known how badly Dean had been hurt. This was the first scene where I thought “Yeah, Sam knows.”
…but the text supports both readings, as usual.