I often hear/read of LE rendering “life saving measures” by performing CPR and pumping out the rest of the actor’s blood.
Frankly, what I’ve seen of cops after they shoot someone, or being the first to cop to a bar shooting, or even when being the first cop to a death in a house, they seem like deer in the headlights, awkward, unsure, and hesitant yet wanting to appear as dignified police, they are easily shaken.