You've likely exhausted it...

[He holds her hand, as if trying to share some of his warmth.]

But it could have also been affected by what happened in there. Let's just try and get some rest first, and if it's still like this in the morning....

[He purses his lips. Can he even help her with his own? Would it be safe to? It's been a while since he felt so uncertain and not as confident to help reassure her.]

We'll figure it out.