I continue to be amazed by what lifeguards can do. Even if drowning looked like drowning there is just so much going on in a crowded pool I cannot imagine how

I continue to be amazed by what lifeguards can do. Even if drowning looked like drowning there is just so much going on in a crowded pool I cannot imagine how people can pick on anything. To me it seems like an audio-visual version of drinking from a firehose. If I was in their place the best strategy that I could conceive of adopting would be to a for loop checking each one out, and perhaps dwelling a little longer on those who I think maybe particularly susceptible. But this would be a terrible strategy, too easy to miss someone, too much latency in revisit time. So a hat tip to all lifeguards on HN, deeply appreciate your work.