https://youtu.be/9YIB8HRGnkU?t=2437
Thoughts on the shift (legal/illegal?) from this punt play from 2000. Lineman are all in a 2pt stance before shifting out. Someone on the line does yell "shift" just before the movement. They are awarded the first down but on the next play, fumble the ball to the defense!
Video should hopefully start at the 40:40 mark.