what would you do if lost in the forest

Well, if one stayed with the injured and the other ran to help the one who was stupid enough to run away from the group, that opens the possibility of two people being lost if the one chasing did not find the runaway and leaving one person with the injured making it harder to get out with the injured.

So, what I would do is let the runaway go (unless it was my best friend, then I would go myself and tell the other to stay with the injured), then use someone's phone (let's face it, the likelihood of each one having one in the group is high) to phone for help. Go back, try look for a larger group to find the runaway, if not, after a few days, contact authorities for missing person.

Who the hell would isolate themselves from a group in the forrest at such a time even if there was something scary they seen? Safer in a group.