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The key is the term In-flight.
A ball that goes off a defensive player or her glove and over the fence in fair territory, remains "in-flight" and therefore a home run.
A ball that hits the fence and then goes over after hitting a defensive player is no longer "in-flight" and therefore a ground rule double.
Another instance of a ball no longer being "in-flight" would be if the ball is hit and looks like a home run but hits a bird before going over the fence. In that case as soon as the ball hits the bird, it is by definition no longer "in-flight". Therefore, after hitting the bird, the balll still goes over the fence it would be ruled a double and not a home run.
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