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The replay I saw showed Stirlo in a grapple for posession with a Bok jersey. Botha charged in shoulder first. I can only guess that the ref didn't penalise it that the ref didn't see it. Let's face it charging shoulder first into a ruck is dangerous no matter whether the pplayer is lying on the ball or playing correctly. the only thing that would make the ref call the lying on the ball before the diving in would be it the lying on the ball occurred first. As a matter of fact, depending on the severity of the dangerous play, it wouldn't be without precedent for the penaly for sealing off to be overturned due to the dangerous play.
My 2c