If the defensive team have the upper hand and drive the attacking team back - fair enough that should be a turnover.
The only real choke tackle in this match went like this -
Roberts drives in, held up for a few seconds by two Irish players, Barnes calls maul. Welsh players drive on , gaining 3 or so metres. Ball goes dead as Irish players fall over on the Welsh side and stop the ball coming out. - scrum to Ireland...
Seems silly to me is all. All perfectly legal, just I don't like that it gives teams the legal option to negatively kill the ball.
Should be changed to the attacking team getting the put in if they're clearly going forward, and would win the ball if the defensive players weren't in the way.