I like to use this flourish at the end of a 3 Fly effect. When the final coin vanishes from the left hand, I close my right hand around all it's coins, as if catching the in-transit 3rd coin. A slight pause and then I roll the coins out into the 3 formation. This helps to build some suspense before the reveal of the 3rd coin. It shows off a bit of skill. And it ends the routine with a nice display.
The mechanics should be pretty easy to pick up from the video. If not, here's a quick tutorial.