Once, Sima Guang was playing with his friends in the backyard, hiding and seeking. There was a large water vat in the yard, and one child climbed onto its rim to play. Suddenly, he slipped and fell into the vat. The vat was large and deep with water, and the child was about to drown. Seeing the accident, the other children were terrified, crying and shouting as they ran outside for help. Thinking…