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Brilliant! Now instead of a large demonstration of people we have a panicking large demonstration of people, hope no one gets crushed!

I don't think that counts as "controlling" a crowd in the USA.

(Plus other comment I made regarding unfortunate scenario where someone returns fire)

You don't need a fucking sniper rifle to fire a shot in the air.

That bullet lands somewhere.

I don't know much about guns but isn't that a negligent discharge?

You only ever fire your weapon when you intend to kill your target.

I don't know much about guns either, nor am I from the US, but according to Barron's Police Office Exam[1], cops must never fire warning shots, at least in NY.

[1] http://books.google.pt/books?id=1uD3HhEqegkC&lpg=PA217&ots=J...