By Alex Prewitt Athletes say it presents challenges unlike any other in the world of luge, bobsled and skeleton. But the most dangerous sequence of the most dangerous venue at the Olympics has perhaps the least intimidating nickname possible. BEIJING — For bobsled, luge and skeleton racers, the twists and turns of sliding tracks are typically abbreviated by their numerical order: Curve 1, Curve 2, Curve 10 and so forth. But certain sections pose such fearsome challenges that they have earned special monikers too. For example, British Columbia’s Whistler Sliding Centre is home to Slingshot, Shi…