Stanback connected on five 3-pointers en route to 21 points, and Marshall added 15 and six rebounds for the Rebels (24-6, 8-4 MWC), who won a second straight game.
Justin Hawkins contributed 11 points and Mike Moser hauled down 11 rebounds for the winners.
The Falcons (13-13, 3-9) were led by Michael Lyons with 18 points and seven rebounds.
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