"Show me your hands!"
"I'm a federal officer."
"Show me some ID! I SAID SHOW MEW YOUR HANDS!"
Outside of making fun of the ATF, what the cop does it what will always scare me about running into scared cops. They yell a half dozen contradictory commands at you that will result in your getting shot, like that kid on his belly in that AZ(?) hotel.
From the armchair, it's easy to say that the safest thing would probably be to stand there with hands outstretched and ignore everything the cop says until someone calmer shows up as backup. In the heat of the moment though, it would be really easy to follow a "wrong" command and get shot.