Last year that was a legal play! This year it’s a 15 yard penalty if there is contact.

Prohibition on Tripping the Runner [2-45, 9-4-3o (NEW), 9-4-3o PENALTY (NEW)] —

In an effort to decrease risk, tripping the runner is now prohibited. It is now a foul to intentionally use the lower leg or foot to obstruct a runner below the knees.