I'd have ended it something like this. "The thought of freezing to death brought with it horror the like of which he had never known. Without purpose or direction he blindly crashed through the unforgiving landscape. Then any hope he might have had was cruelly extinguished when he noticed his own footprints. He'd been heading back along his own track. With a sob he threw himself to the ground, utterly defeated. The smell of smoke? His first fire, still smouldering just beyond the ridge...