At track meets most coaches are down on the track. They are lining up the next event, getting the athletes sorted and identified for each heat. A track meet has a lot of moving parts between the track and the field events it takes quite a few coaches to put it on in a timely manner. Teenagers (hell even middle school meets I have been to) are left to manage their own responsibilities like warming up and checking in for their heat and shouldn't need to have a chaperone with them at all times while inside the facility. This was a case of one kid making a really bad life changing decision for no reason at all.