As you walk underneath it, you feel something suddenly tighten against your ankle and pull taut. Your body shifts to your right, and you hear the sound of a rope, or maybe a whip, snapping into place above you, and your foot lurches upward. You've walked right into a tripwire trap, camouflaged in the snow, and it's trying to throw you up into the air by your foot! You, however, are faster than that: although the trap caught you by surprise, your reflexes are honed well enough that, the very moment you see the rope pull taut in the snow, you manage to unsheathe your spiraled staff and give it a fierce swipe, cutting it before it has a chance to fling you upward. The lousy rope swings upward, flung by the force of some hidden counterweight, and the tree above you suddenly snaps into place as the rope dangles uselessly from one of its limbs.