Andre Iguodala had just hit a fallaway jumper for a 99-97 lead for the Sixers - who led the entire fourth quarter until the final basket.
Pierce pump-faked a defender, dribbled toward the top of the 3-point arc, then swung the ball around to a waiting Allen. One of the best 3-pointer shooters in NBA history promptly sank another to stun the Sixers.
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