His anger is starting to wane a little bit, as he notices that moment of frustration, starts to see exactly what she's doing to herself. Which means he's also noticing the blankness.

He's still mad. But now he's also starting to be concerned and frustrated himself.

"There is no being prepared here. Not in that way. There is no way to keep people from getting hurt, killed, or traumatized, no matter how well you prepare, because we never know what's coming. I'm not saying you should stop trying to protect people, but you need to recognize when your normal ways of protecting people aren't working. Stalking inmates when we don't know what's coming isn't going to keep anyone from being attacked, it's going to wind them up until they do it out of spite."

He gathers breath to say something else and then lets it whoosh out as he truly registers the way she looks. "...What happened? Are you okay?"