@Turbine D
Given only the photos of the engine remains, it is impossible to tell if the engines were operating at high N1, there is nothing to go by at the moment.
Attached is an interesting comparison showing turbine damage on two identical engines, one where most of the blades are broken off about half way between root and tip, operating with some power applied, and another on the same aircraft which, at the time of impact, was stationary or windmilling with little or no power on. Compare this with the two photos of the same engine from AF447, where the rotating blades are missing, apparently torn away at the roots. Another example of a stationary or mild windmilling fan section, is that shown in my previous post where we see just the bottom section of one of TWA800 engines with fan blades bent in both directions away from the point of impact.
PICTURES: BA Boeing 777 Heathrow crash evidence
TWA800 example:
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