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Belfort's fights don't often go the distance, but Bisping's sometimes do. If Belfort goes out, explodes in the first round and Bisping is still standing, he'll have to be able to keep doing it again and again.
Look back to Belfort's most recent contest—a UFC 152 loss to Jon Jones. After nearly pulling off an upset for the ages in the bout's opening moments, Belfort more or less lulled around cage waiting for the inevitable to happen. He even pulled guard in favor of attempting to break through Jones' range.
That wasn't exactly a one-time occurrence, either. Indeed, Belfort has a bad habit of becoming complacent if he's unable to score a finish early on.
Cooling off after an early onslaught is not something he can afford to do at UFC on FX 7. Bisping is a resilient fighter with good head movement. The chances are that Belfort will need to launch more than one blitz to end things.
That means he'll have to keep coming, even if his persistence takes 15 minutes to pay dividends.