@thefallguy:
This case wasn't really about copyright yet. It was about whether Reddit should disclose Darkspilvers identity to Watchtower.
So the judge only checked if Watchtower's copyright claim have at least some merit. This judge didn't need to really rule on whether Darkspilver violated copyright or not.
The judged ruled that Watchtowers case has enough merit to justify sueing him for copyright infringement, therefore she ordered Reddit to give up his ID to Watchtowers lawyers.