Illegal Low Block

[JRutledge]

Originally posted by RonRod
Is it illegal for the tight-end, off the whistle, to lung head first at the defensive-end and hit/block him below the knees?

Without further information and not knowing what "off the whistle" means, it can be. If the TE does not fit the requirements of the "Free-Blocking zone," then the answer is yes it is illegal. But honestly, we need more information or discription of your situation to know for sure.

Peace