High-low combination?

[JRutledge]

Originally Posted by Robert Goodman

The plan is for the blocking back to act as backup behind the lineman who's making an at-or-below-the-knees block. If the lineman knocks the opposing lineman down, the back doesn't make contact. If the lineman doesn't knock the opposing lineman down, the back is ready to block. The contacts might occur in quick succession, but only according to the defender's charge.

None of that sounds like a foul. Not even sure why I would consider this illegal in any way.

Peace