Foot completely on ground outside the box

[Bandit]

"but what does surprise me is that neither of the 2 BU's called it."

For the base umpires to make this call would create a serious problem in at least 2 ways. (1) the offensive coach would be chewing the plate umpires back side then and for the next 3 innings about how an umpire 60 plus feet away called the foot violation and (2) the quicker the plate umpire could get to the locker room would be the quicker he/she could hang the partner!