[bongodriver]

It would seem that it was an 'inadvertent' ejection... i.e. the pilot did not initiate the sequence himself, it seems there was no emergency situation to warrant doing so, even in the event of a fire it is not recomended to eject on the ground, if it was inadvertent then it was likely a malfunction and that could mean the seat fired through the canopy because the fault may have been just in the seat rockets, that would explain things like parachutes not deploying too.