I'm sure it's just a difference of opinion on the meaning of the term "fling," which I'd describe as less violent than "throw." :)

At any rate, they are more than dropped, since dropping it would leave it in the way. They have to angle it with some small force behind them, but obviously not so hard as to knock the ump out, much as they might wish to do so. "Tossed," perhaps, is a good word.