re: Florida deputy fatally shot US airman that answered the door with a gun

One thing I didn't really catch on the first view is how visible is the officer from the peephole. He appears to be in front of it briefly then moves to the side to varying degrees - always moving.

I don't know what SOP is when knocking on a door in this situation but I would think they would want to be visible to a certain degree - but that can make them vulnerable to someone shooting through the door...