Thanks for the link Harv. I am not sure that's illegal, and if it is, it's block from behind call and not a "while the defender was engaged" call.

It is immoral and unethical, because the Guard is diving with his full weight at the side of the DT's knee and leg and the only way to knock him down is to collapse the leg from the side. He doesn't move far enough to get his head or elbow in front of the player. He just collapsed his leg like they did to Jurko in Dallas.

He is barely, briefly engaged with the Center, who is running past him to get play-side and kick out the other DT or ILB. The Center is trying to run away from him and its the Lion who puts his hands on the Seahawks briefly after the C tired to rush pat him.

Its why they should just ban going low.