In backpacking, bringing too much stuff (especially the wrong kind of stuff) is a beginner mistake. If he hadn't brought 3 pounds for the large knife and machete and made similar reduction in equipment elsewhere, he would have exerted himself less.

Also, an experienced hiker knows that if you drink half your water but you aren't yet halfway done the trail, you should turn around and go back. You can estimate this based on elapsed time if necessary.