The Board Shoots Forward
Mechanism / Why It Happens
Depending on timing, your front foot force conflicts with the board’s force
As explained, a heelflip rotates when you flick your front foot diagonally downward. However, right after popping the tail, the nose carries a strong upward force. Trying to push the nose downward with your front foot at that moment is essentially making your front foot fight against the very force you generated through your whole body when popping the tail. Even if your front foot doesn’t lose, the two strong opposing forces cancel each other out, and the unresolved force ends up pushing the board forward.
What to Do
Delaying the flick timing intentionally is hard, but relaxing your leg is easier
As explained, starting the flick immediately after popping the tail increases the chance of the boar