Raghu came to Madhav’s rescue when he started drowning in the lake. Despite their earlier argument, Raghu did not hesitate to save his friend’s life. After Madhav was saved, he engraved on a stone, "Today my best friend saved my life," symbolizing that good deeds should be remembered forever. This incident made Madhav realize the importance of cherishing the good actions people do for us, unlike the bad experiences, which we should let go of, just like he had written on the sand.