In Sonic the Hedgehog 4: Episode II the player can cancel the move by pressing the Tag Action while flying, and doing this will make Sonic jump from Tails' hands. The player can also attack enemies by flying underneath the enemy.
In Multiplayer mode, like Submarine Combo, Tails' movement is controlled by Tails' player. If Sonic's player presses the Jump button he will jump off Tails' hands, both players can either can cancel the move by pressing the Tag Action button for Sonic to simply drop from Tails' hands.
Using the Copter Combo Tag Action, or any other Tag Action, while you are Super Sonic will revert Sonic back to his normal state.