Filed under: USA, FanHouse Exclusive, SnowboardHe's improving. They've taken out the breathing tube. They say he's responding to simple commands. But the U.S. no longer has two contenders favored to perhaps win both gold and silver halfpipe medals in next month's Olympic Games. Though Shaun White may be the one watching his country's flag raised in his honor after an electrifying run, snowboard star Kevin Pearce will still be in the hospital, trying to relearn to walk. On December 31, Pearce was working out in the giant Superpipe at Park City Mountain Resort (PCMR), the same pipe used for the 2002 Salt Lake Olympi