With so much emphasis on the position of the fuel pump switches, I hope some tests were done to determine whether a 70g impact would be sufficient for them to move from ON to OFF.
A 70g impact would also shake up the tank contents a good deal, so any water that was in the tank, for instance as droplets on the capacitance fuel probes, would have been washed off and could conceivably have been in suspension in the drained fuel.