It is to get the second half of the final group if I remember the rules correctly. Three rounds, 16 even (or nearly even) split groups...one winner per group. Then face offs or something until they get down to four again to face the four winner of the round we are about to start in two days. Thus a relatively quick refresh to get those that either got out due to serious fangirl (or fanboy) characters, or those that got out due to poor placement in the larger groups.
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