human
A person who succumbs to drowning doesn't just do so immediately,  the signs of a struggling swimmer are easy to spot with training.  Furthermore,  training and practice is required to intervene safely without putting additional lives at risk.  Did the TDSB prepare the adult supervisors on this trip with the proper water safety and lifesaving skills?  Water rescue?  Was there a lifeguard on the trip?  It sounds like none of the adults knew what to do and nobody was able to intervene.
gpt
{"moderation": ["safe"]}