Canadian Ruling
If the guard was stationary and positioned in the Close Line Play Area (2 yards ahead and behind the line, from tackle to tackle)at the time of the snap, and the block occured in this zone then it is legal.
If the player wasn't set in the CLPA or the block occured outside the CLPA then it's an illegal block. I've seen some nasty injuries from low blocks and would not hesitate to call it seeing how the intent of the rule is the safety of the players.
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