It's 4:30 . You've got about a half-hour of daylight left and one headlamp between you and your two friends. You ran out of water about an hour ago. You're staring at a 50 degree colouir to the bottom of a drainage that may or may not get you back to your vehicle. Above you is a steep slope of rock, ice and occasional evergreen bramble. Somewhere beyond that climb is a trail. Maybe. You have a decision to make. Do you climb up and risk running into an un-climbable rock face, or do you slide into the unknown facing a similar un-descendible face? You've been terrain trapped.