@haitch could you explain it a little further? did the pool mine his own chain? did it win every block in this ghost chain then? because no other network capacity mining on that ghost chain? would mean that difficulty in this chain would drop in order to hold the 4 mins per block? how is the main chain determined when each chain has the same length?
and more practical matters:
does the pool now mine on the main chain again?
what shall the miners of the pool do?
mining burst I have the feeling of stumbling from one trap to another lulz