It absolutely was a wrong decision. It's the most brain dead thing I've ever seen.It was tough because the bounce put the ball on his head and he couldn’t protect himself, but it wasn’t a wrong decision.
Further to this, it’s known as the “Mathew Primus” rule. To stop ruckmen from running past the line and blocking the opposing ruckman out of the contest. You can block if it’s a legitimate part of going for the ball, but you can’t do it as a seperate action. In this case TDK puts his arm out and blocks the ruckman and then goes for the ball.
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