These were qualities that he had not experienced with hostile, untrusting adults. A children's game is tragically misinterpreted by the monster, and he throws Little Maria into the lake, unintentionally drowning her and turning the surrounding village's population into a lynch mob, seeking revenge after the child's body is found.
He had never encountered such kindness from adults before, but a children's game was tragically misconstrued by the monster, leading him to throw Little Maria into the lake and drown her. This tragedy triggered a vengeful mob in the village, seeking retribution after the child's body was discovered.