How do you stop the sprinting, slashing and swaggering Houston Rockets? Step in front of them, of course. The Heat’s defense drew two critical charges in the final minute of Wednesday’s 114-108 victory against Houston to hold off a furious comeback and extend Miami’s dominance against Western Conference foes. The Heat (32-14 overall) is now 16-5 in games against teams from the Western Conference. Last season, the Heat won just 11 games against the West, albeit during a lockout-shortened schedule. Miami led by 10 points midway through the period at AmericanAirlines Arena but, led by James Harden, the Rockets charged within a point with less than a minute left. The Heat led 109-106 with 46.3 seconds remaining when Harden sliced through the lane and slammed into Mario Chalmers, who planted his feet in the paint moments before Harden could get up a shot. Harden was called for a charge and the Rockets never got any closer. “Houston is one of the toughest teams to guard in the league,” said Dwyane Wade, who finished with 31 points.