Malins is too slow for an international player.
The sexton one was a shoulder to the head, the difference between a yellow and a red was that sexton was crouched down and Williams was absorbing the tackle.maybe so, it's not something I gaf about because I think on the whole it doesn't influence the ref's decision. Maybe the Sexton factor made a difference, but more his reputation* rather than the rolling around. The decision making process was about body position and movement control vs intent. They should have been judged equally imo.
*he'll be playing on a 'is this his last game' advantage for a while now I reckon.
Eta: I guess what I'm saying is, I was talking about the ref not the players.