I think the "never/ever" and "he has to go over in his mind" to me are more about the conditions of their minds at that stage, and less to do with the game of poker.
What I mean is, in that state of tiredness, you are no longer sure of what you are seeing/thinking/saying.
Im sure we have all been in that state of doubting what we think/see because we are so tired. I am guessing thats what that was for him. He knew deep down he wasnt folding, I would guess, but to him, he needed to reset and go over everything,.....a sort of am I really seeing what I think I am seeing.
I dont know if that makes sense, but thats how im trying to relate to both players at that spot. I was tired, and I was just watching...until I passed out