From Melbourne and also a union fan, thats two strikes already
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Trust me rugby guys especially league guy (which have a better and more at speed defense) are hard hitters. The thing is that tackles aren't just big hits but big hits:
-that secure the ball (prevent offloads),
-drives the opponent back (lifting and driving with the legs or big hits) and
-slowing down the play the ball (giving your team more time to reset their defensive line by lying on the player forcing him on his back etc).
In rugby league the most dangerous types of tackles isn't the big hits but the spear tackle (like a pile drive), elbows/knees/head to head clash, and the grapple tackle which usually involves 2-3 players attacking the head and neck area (by twisting the neck and forcing the tackled on his back and by cutting off oxygen and blood to the head).
Spear Tackle
Grapple Tackle