He has been watching this thought process with some apprehension, because while he has learned the hard way that Mariona must be allowed pauses to think if she is to end up thinking at all, it is also only just now occurring to him how much this behavioral principle leans on his ability to beat wrong answers out of Mariona if she arrives at an incorrect thought after thinking.
To hear this as her response after thinking is... not good, not terrible.
But he will say the rest of his words all at once.