Agreed, even tough I think the ref was harsh with the time. It doesn't need a speech, it requires a Martin Johnson like "Ref says stop f#cking infringing or else!"
But Farrell has shown himself to be a poor captain before anyway. Interesting in Scum V there is some implication that the Welsh players look at referee tendencies and play tp them. I think Biggar pulled this same trick with the same referee before.