[ Terrible phrasing, Theo calls it, and he chooses not to comment. Not to say that no, the phrasing is perfectly accurate. It's the truth of the sentiment that's the problem. ]

Believe me, some days I do nothing but hope that I haven't made a terrible miscalculation. [ His voice drops to almost nothing, so quiet that it isn't really a voice, only breath shaped into words. ] But this? This I am certain of.

[ With his spoken hand, he lifts Theo's hair slightly. So that he can press the cold cloth to the back of his neck. If nothing else, bringing his body temperature down seems important for keeping him comfortable. ]