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Sorry about that hard drive. Not fun at all.
Running backwards for a few seconds is fairly common after a mainspring lets go. Just a guess here but maybe a sudden release of power causes the spring to overshoot its neutral point and wind a bit in the opposite direction. A little like when a movement is allowed to run down with the pallet removed. The escape wheel will spin until all mainspring power is expended and due to inertia will continue to spin a bit more causing the mainspring to wind slightly in the opposite direction. After stopping the escape wheel will then spin for a few seconds in the opposite direction.