Respectfully, I can't share cynicism that tough guys tend to die first. My sense is that the weak die first. The will of this woman carried her to rescue following the harrowing experience of losing her companion to death. His demise was an accident that transcended toughness. An accident can befall anyone. Yes, be wary, be prepared. Sometimes the slope will be deadly, slippery ... take the chance and you are gone. Nothing to do with being tough.
It is the after time, the bare realization, the slogging, the cold, the hunger, the looking to an empty sky where you seek hope ... defying it all through persistence, doggedly hanging on. That's tough.
In my world that's tough anyway.