Depends on the flies- I'm allergic to blackfly bites. Everything else I can ignore or dies when it drinks my blood.

But you're right, mental preparedness is key. While my reason to keep going isn't as strong as Blast's, they are mine and they require that I die properly. Freezing to death or being ecxanguinated (sp) by bugs are not part of the plan; too many people count on me for me to pass on without sharing that which is in my head.