What was the first warning sign that alarmed Megan Garcia about her son Sewell's changing behavior?

The first warning sign that alarmed Megan Garcia occurred in summer 2023, when her son Sewell suddenly wanted to stop playing basketball. This was particularly concerning because Sewell had played basketball since he was five or six years old and, at six foot three, had all the makings of a future great athlete. This abrupt change in interest was deeply troubling to Megan after the years of time, money, and effort invested in his athletic development. The sudden disinterest in a sport he had loved since childhood served as a critical red flag indicating something significant had changed in Sewell's life, ultimately contributing to the tragic outcome discussed in the episode.