Why was being seriously injured synonymous with being killed in hatchet?

In "Hatchet" by Gary Paulsen, being seriously injured often equates to being killed because the protagonist, Brian, is isolated in the wilderness with no immediate access to medical help. Serious injuries could lead to life-threatening situations, such as infection or inability to hunt for food, which jeopardizes his survival. The harsh realities of nature highlight that even a small injury can have fatal consequences in such a rugged environment. Thus, injury is not just a physical setback but a critical challenge to his survival.