[Between Kanji's announcement, looking for Nathan and calling him herself, and failed confirmation from the wardens there's no real doubt left for her that Nathan's gone.
And it hurts.
It hurts because that's it. No more chances for any of them to work on making things better for him. He deserved better than what his mind did to him. It hurts because even if she knows where his body is, she doesn't know about his mind. Is it trapped in some facility back home alone? Is that what he's living an feeling every day now? Is it just dark and blank like death? Like she imagines death. It hurts because she loves him and it hurts to lose the ones you love no matter how much practice you have.
Somewhere along the way looking for Nathan turned into looking for Reid even if she was only half aware of it. She follows the sad sound of piano notes to him. She's not going to try to speak and for once today it's a relief, not an obstacle. Instead, she quietly takes a seat next to him on the bench.]