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Neither one. The spark was a short to ground before it got to the solenoid/starter. What that does is possibly damage the battery or the cable connection if it sparked for any length of time. It's not uncommon for the starter drive to stick in the ring gear when the battery is low and the engine won't start. The release of pressure when the engine first starts is part of what helps the drive retract.....along with that spring in the solenoid.
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