All the U.19 variation does is to stipulate when the scrum MUST be reduced below 8, .
I don't think it does that. It just says what happens in the circs when one team CANNOT supply eight players for the scrum - a situation which never happens as team always CAN supply eight players.. if they wish to. The only players you can run out of are front row [EDIT - Front FIVE].. and then you are going uncontested, so you can STILL safely supply eight players.
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