Why didn’t the cops give Narcan? Get him out of the prone position? Why didn’t they check his pulse?

Had they done what they should have, there wouldn’t be a trial. It’s that Chauvin knelt on his neck even after his body went limp. When officer lane said shouldn’t we move him to his side is when Chauvin should have got off Floyd.

Scared of the crowd? Check the pulse and say yep, still breathing. That would have de-escalated the crowd.

The defense reasoning is bogus and I highly doubt the jury will believe the officers were afraid. If you are scared of a crowd that size you probably shouldn't be a police officer.