He patiently holds her until the last drop, a little amazed that she was that thirsty.

"Would you like some more?"

And as he tends to her (whether by giving her more water or settling her back down) he informs her, "The others will be here any time now. Because of... how your wound happened, there will always be someone at your side. So please rest assured."

Even though she'd volunteered to run into the burning house, that did not mean that she was more resistant to her history coming back to pain her. Being by her side was the least any of them could do for her.