Ok look, I want to go to the Lighthouse as bad as the next guy, but leaving Trials before the reward screen should be a forfeiture of the match. It's aggravating, rude, and irritating.
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Nothing rude about it at all. Teams leave the match after the win posts to their card and before the rewards screen because it saves time getting to a new match. On average, it saves 30-45 seconds between matches by leaving then. It's not a loss on their cards because the match had already ended and the win posted on their card.