As you advance through a course, you'll occasionally come across a blue shield that allows you to pass through obstacles without ending your run. This is of course quite useful, but don't let that temporary power go to your head. When its effects vanish, you'll be extremely vulnerable once more. Make sure that you don't put yourself into a dangerous position, or your invincibility could end just when you need it most. Instead, continue to navigate the course with reasonable caution, and keep your eye on the road ahead.