eone face down in water will survive perhaps 2 mins if healthy [just my guess]
i will leave this pointless exercise until the facts are made available as common sense apparently is not enough to go on
I think you've been on too many health and safety courses myself. Or paralysis by analysis courses as they would sometimes better be called.
It was a boating lake, no one knows whether the man could have been helped. The only way to find that out would have been to drag him out ASAP then worry about it. There is NO excuse for a gang of so called emergency services personel to stand around like gawps in that situation whatever you may say. Not even for one minute, not even if they would have got a bit wet, not even if there might have been toxic mud, or aggresive ducks, or reckless canoeists, or if they had a bit of a headache.
Is that clear.