Running creates more noise than walking. Nature gives you all the cover you need, but it conceals your enemies as well. Doesn’t matter if you’re part of an army or by yourself, you must constantly be aware of your surroundings. Take your time to navigate safely because you don’t want to alert everyone to your presence.
Woodland hunters set traps to catch animals and people alike. Traps are easy to set and even easier to conceal if you aren’t paying attention. When you run, you aren’t able to pay attention to all the details in the woods. That one misstep will be the difference between life and death. Unless you’re on the run for your life, do the smart thing and walk. Slow and steady keeps you alive in Aftermath.