FiveFrameSwing
Banned
Yes initial movement starts at or before pitcher movement, but the full stride doesn't occur until the ball speed is determined.
Go to YouTube and search ULL (Lafayette) or Lotief or Elkins
The forward movement better start at, or before, the release of the pitch ... otherwise the hitter will have the game sped up on them and will be rushed.
This isn't a small thing. It's the holy grail of hitting.