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Just for clarification purpose I assume you are referring to a block below the waist as a cut block? This is also at times confused with a chop block (which is a high-low combination and is always illegal with no real exceptions in any rule code).I know the NFL has eliminated cut blocks, and the NCAA has modified the rule slightly this year, but what is the rule on cut blocking in high school?
Blocking below the waist is just as legal for the defense as it is for the offense.
Is a barrel roll a legal way to take out offensive linemen by defensive linemen while they are whipping their legs against a gun offense where the ball has left the zone?
Simple question. Complicated answer.
Since it's lineman on lineman, the answer seems to be yes. But once the ball leaves the zone, there is no free blocking zone, so it's no. The lineman are given the chance to block low on an initial charge, but is a barrel roll an initial charge? Hard to say. The real complication in this comes with the simple fact that no offensive lineman who is doing his job is going to stand still and see what the defense does to him, so he's moving to engage, most likely, and that will be a mitigating factor (it will make it into a factor that makes it really hard to officiate.)
The intent of the rule outlawing low blocks is to take out the open field low blocks at speed, usually done by the offense but they can be done by the defense, as noted above. Low blocks in the interior line remain legal, in certain conditions mentioned above, but there is still gray area.
Not meaning to give such a non-committal answer, but it's very hard to give a blanket judgment on the blocks you describe. Some could be legal, some not.