StuBoot
Bencher
And as there was no penalty they couldn't challenge is the way I read it.The captains challenge rules are on page 70 of link. It seems to me that the rules say that last night all the Roosters could challenge was the referee's call to stop play as the Rooster couldn't play the ball properly.
The captain can only challenge decisions by the Referee which cause play to stop. (i.e. any decision by the referee to ‘play-on’ cannot be challenged)
So did he challenge the knock on in the tackle/play the ball or the high tackle is the question?