"one of the stronger members flopped over on the snow on his back in total exhaustion" because he tried to be a team player and keep up with your pace. He was ashamed to fall back and move slower.
Both of you would have been better had he split from your main team and just followed already broken trail.
I believe that Traill Boss' attitude is more rational e.g. when he is not trying to keep up with Waynald or Little Brown Mushroom and is willing to fall back and hike slower.