Townsend's spot on,wasn't even a booking.
The two footed challenge has been outlawed since 2005. There is no caveat based on being it being low, or that showing studs is unavoidable or whether the player won the ball cleanly. A two footed challenge is deemed 'excessive force' and because of that it is a red card offence. Someone is within their rights to disagree with the laws but to say the referee got it wrong is rather harsh by Townsend.