DePack said:
I don't think Favre throws those blocks while he is "moving with the ball", but I could be wrong. It's simple...the rule you are quoting is for a crackback block. Wideouts can't go in motion toward the center and block someone below the waste around the line of scrimmage.
If a lineman is engaged another player cannot block him below the waist. On the line as long as aplayeris not engaged and the block is from the FRONT it is legal as long as you are inside the Tackle box. That is where it gets shady. The FRONT is close to the SIDE .
In the open field you are not allowed to go against the grain to block below the waist. I have had many discussions with Refs about this and the rule is so shady that it makes it near impossible to call unless you get a PERFECT look at it. Alot of times A guys will make initial contact around the waist and it looks like a block below it simply because gravity takes effect. Also if the player makes a "FOOTBALL MOVE" that causes him to get blocked belowthe waist it cannot be called.
To sum it up, the only way you can really get it called against you is if you either block a stationary opponet below the waist from the extreme side or from the back or if a guy is running at you and you go for his knees. Hitting high thigh is usually not called.
Other than that there are to many other factors that could cause you to actually block below the waist without meaning to. It usually has to be clear as day to draw any yellow from it.