Scots overcome Tonga hurdle but Ritchie to miss Romania

But Townsend railed against the television match official and bunker review system after Afusipa Taumoepeau was only yellow carded for a head-high tackle on captain Jamie Ritchie.

Ritchie failed his head injury assessment and having already gone over the threshold of five previous concussions now faces 12 days on the sidelines in line with the return-to-play protocol.

It means the flanker will miss their must-win match against Romania in Lille on September 30, but should be back for a potential winner-takes-all clash against Ireland in the two sides' final pool game on October 7 in Paris.

"It's very disappointing that our captain, one of our key players, was hit in the head and was removed from the game," Townsend said.

The former Scotland and British and Irish Lions fly-half said he didn't understand how the review system was being operated.

"They're trying to look at ways of not giving a red card rather than referee what is a legal tackle... (it) should be a red card in my opinion.

"The TMO/bunker is not being delivered as I thought it would be, which is only (using it) if the referee at the time isn't sure if it's a yellow or red card."

"This is our showcase to show what's legal... I don't think it's good enough."

Turning to the result, with Scotland outscoring Tonga by seven tries to two, Townsend said the "game plan and intent and our contact work were really good".

"It's a six-day turnaround to Romania now and we know we've got to improve on this performance to get a bonus-point win. Then, we've got a shootout against Ireland if that's the case.

"We know we have to win our next two games."

Fly-half Finn Russell, who stood in as skipper after Ritchie's departure in the 34th minute, said the team had loved getting