We had this earlier this year.
In the pregame, the visiting coach warned us that, on film, their opponent has been sending a LB to cut the legs out from under the lead blocker (fullback) on toss sweep plays. Presumably to clear the way for another defender to get the tailback.
Sure enough, 3 or 4 times we flagged a LB for flying off the corner and wiping out the fullback around the knees. Coach went bananas over it, but blocking below the waist goes both ways.
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