Edge runs alone in an endurance race against the others, reminding them they're rivals not friends, but he gets lost & realizes what's important. The others accept that they're all there to win - against each other.
Edge alienates the boys with his 'win at all costs' attitude at a triathlon event, by not helping Matt when he falls off his bike. To teach him a lesson, Heath doesn't bother to pick up a race marker when it falls over, and Edge takes the wrong path, getting completely lost in the National Park.