I think the main reason for this incident is that the safety measures of Han Xiu Theatre are not in place. If safety measures are put in place, the couple's son will not fall off his seat because of naughty activities, and the couple will not both die because of saving their son.
This incident also reminds the general public that when taking children to a performance or a movie, they must be warned not to be naughty and active, and not to put their hands into the gaps in their seats. If there is a high platform, they must sit safely to avoid falling and accidents.
Of course, you should pay attention not only when watching performances or movies, but also when children get on escalators or elevators. When climbing the escalator, parents should tell their children not to play on the escalator and not to stay on it after the escalator arrives. Stay away from the escalator when you have nothing to do. When taking the elevator, tell your child not to press the elevator button on other floors, and don't use a water gun to help the elevator chassis. Unless there is an emergency, don't press the distress button. Of course, don't pee in the elevator at will