Yes, her training would be to preserve life, if possible, even in these circumstances.
I don’t think anybody would have blamed her if she hadn’t tried to do CPR in the circumstances - she could have legitimately argued she was in shock herself or that she feared he was faking.
But it looks like she did the job she’s trained to do in literally text book fashion.
I would guess they have to. They are most likely told to do this as standard.
I would feel no such obligation or duty. I would assume they are faking and keep them at gunpoint.
“…I don’t think anybody would have blamed her if she hadn’t tried to do CPR in the circumstances - she could have legitimately argued she was in shock herself or that she feared he was faking.…”
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And, judging from the picture in post 1 above, if he was faking the knife remains perilously close to his right hand. An American cop would typically have kicked it away.