I agree with you redmonk to an extent. hypothetical... say you are climbing Rainier with your buds and you all have excensive experance, the weathers great you feel good everyone says they feel good but someone comes down with HACE and you are at the top of Rainier now in a small linticular cloud. Your partner wouldn't quit because he didn't want to let the team ( team of 3) down so he kept on going. Now what are you going to do this man has increasing ICP and you are stuck. Because we not prepared for the for worse. This man might die. Of course evac is the only possible soloution but at a time like this would you reget not having a cell phone ???