>>49832949
Showing how war the kid seems to be from the village, its fair to assume he was abandoned. Its a normal practise in extreme situations for parents to leave the weaker child somewhere so the they can better provide for the older and stronger one(s). Rumia knew what was going on, and she acted accordingly. You might argue about the killing method, though, a neck snap would have been more instant and merciful than painfully crushing him into rocks repeatedly, but its not like humans also go for painful killings towards small animals without need. Everything's balanced by nature.