Getty Melquizael Costa UFC Melquizael Costa reacted to losing a unanimous decision to Arnold Allen in the main event of UFC Vegas 117 on Saturday night in Las Vegas. Allen knocked Costa down in the first round , and from there it was pretty much smooth sailing for him, as he controlled most of the fight on the feet and on the ground for an unanimous decision win. With the loss, Costa’s six-fight winning streak was snapped, while Allen got back on track following a defeat to Jean Silva in his