Another Quebec Chris on this forum! Good to see you here.
If you want to talk about the lineout situation, that's completely different. The defending team has the ability to contest should they want to and chose not to. Red never gained an advantage. However, if we were to transpose the off the feet situation and put it into the lineout situation, it would be the attacking team holding down the defending jumper so he never would have a chance to contest for the ball. Two completely different scenarios.
Back to the ruck...No defender with half a brain will contest a ruck that looks like this for example:
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The point is that the contest was taken away. There isn't 1 player in the world who could hit 3 guys lying on top of each other and push them off the ball. All it would take is 1 ref calling it right at the beginning of the game and then the players will all ruck properly. There are plenty of examples of players rucking properly in every match, but sometimes they choose to be lazy or cut corners, and they should be dinged for it. Here's a perfectly good example of a player who stays on his feet at the ruck and who could have easily hit the English defender and flopped down afterwards.
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You can find tons of these situations in every international and top level match and almost just as many lazy players falling on rucks. There's absolutely no reason for it and the IRB should do something to crack down on it. What you see most of the time is not even an effort to stay on their feet and they just flop down instead, or hit a retreating defender as they flop. It's a player safety issue as well as I'm sure at some point there will be a bad injury because of something like this which happens many times a game.
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I should point out that the player in this situation was accelerating and was out of position compared to the ball carrier, so he sped up and went head first into the English tackler(who was starting his motion to roll away) and was always shooting down. Also, while it looks like he might have been tripped, he wasn't.
I'll jump back quickly to your point about the lineout not being straight. Let's assume that at the Super League level the players are world class (they aren't), if the ball is thrown to the back jumper at the 15m line, then most of the time the ball will be well on it's way there before the players start to lift or jump. This is plenty of time for a defensive team to decide whether or not the ball can even be reached and then not bother putting anyone up. Should you still not call the not straight in this situation? My main point with that is every situation is unique on the rugby field and you have to ref it like that.
And if I finish with replying to your first comment of does it negatively impact the flow of the game? Maybe not, maybe it does, we can't know unless they stay on their feet. Every player at the top level is smart enough to know not to hit a ruck in that situation since they're just wasting energy. We can never know what would have happened if the defenders stayed on their feet. What it does do is negatively impact the image of the game and I can guarantee it will result in a serious injury at some point, if it hasn't already.