Reply #10: An educated guess on how it happened.

[Silverhair]

Knife is one of those blades on a folding tool kit. Leader is using knife for some sort of work. Scout starts to fall. Leader throws knife to ground to catch falling boy. (Normally that would be smart. You don't try to catch someone with a knife in your hand.) Knife lands in leaves which prevent hold it in upright position. Leader misses catch, boy falls on knife. (A falling boy would provide the energy needed for the knife to penetrate the skull.)

Freak accident.