Harry stared at the bodies and tried to think. There was no time for doubts, for caveats, no brakes or second-guessing just take the first thoughts and run with them

In the back of Harry's mind, fragments of abstract thought flitted past, heuristics of problem-solving that there was no time to rehearse in words. In wordless flashes they shot past, to set up the object-level problem.

- the first place to look for a problem is whatever aspect of the situation seems most improbable

- simple explanations are more probable, eliminate separate improbabilities that must be postulated -

- what do I notice I am confused by -