It's very regrettable, though not surprising, that his first reaction to her help is yet more fear and resistance. But his mind has already wrought itself into such exhaustion that his brief struggle barely even registers against her gentle but firm influence, and then he stills and she feels his relief. There, see, no reason to be afraid. She's only suppressing his panic for now, she can't just erase it, but once he's calmed down more he should be able to regulate his emotions himself. That will be healthier and more stable, too.

Releasing him from his perceived prison might also help. He is too worn out and passive to break out on his own, not like Johnny did when she'd soothed his nightmare, but his weakness means the setting is a little more easily suggestible than when he had a tight utterly panicked hold on it. She doesn't bother with the control panel behind her, doesn't concern herself much with the internal consistency of this dream, instead carefully imposes a single thought; there is simply no more water. Evaporated, or drained, or whatever he expects of this context, but it is gone and he is dry and the glass slides out of the way with a hiss.