Zombie Apocalypse.

You station your group in a vast open field. The team exits their vehicles and begin to set up camp. Small figures can be seen in the distance, but it's very difficult to make them out, as it is very late and rather dark. Hesitant to open fire at them immediately (they could be survivors) you wait. Your team is getting anxious, will you continue to wait until you can clearly see if they're zombie or not, or will you shoot at them? Take everything into consideration.