On the Android build, if you flick down while the coin is in the air, then flick down again right as the coin hits the hand, whenever you try to flick up, the hand will close automatically as soon as you release the finger off the screen. The bug will stop whenever the coin hits the hand while it's open. The quickest way to do this is to flick upwards and not lift one's finger off the screen until the coin hits the hand.
On the Android build, if you flick down while the coin is in the air, then flick down again right as the coin hits the hand, whenever you try to flick up, the hand will close automatically as soon as you release the finger off the screen. The bug will stop whenever the coin hits the hand while it's open. The quickest way to do this is to flick upwards and not lift one's finger off the screen until the coin hits the hand.