Lefty Move to First

[umpire99]

I had a game the other day (FED) with a left-handed pitcher who picked off four runners. Here is what I saw and I want to be sure I didn't miss any balks. As F1 lifted his non-pivot foot his shoulders leaned toward the plate. He would then shift his momentum, step legally and throw to first. I did not call a balk on any of the pickoffs. I know this is a HTBT but did I miss something?