I agree with Wafer's words. I might add that Mike Brown did well to try and kick the ball, given that he approached correctly, was being manhandled as he tried - in the grand scheme of the ruck - and was probably trying to boot the ball as far away from the posts as possible. Conor Murray might have had his hands nearer his head to avoid accidents happening; unfortunately, he kept finding them around the ball!
Regarding scrums, would it be a good idea for the clock to stop when the whistle is blown, and the clock restarted when the ball has made it out of the back, or thereabouts? Saves all those minutes of false knowledge, and teams will know they cannot gain any time advantage or negate the skills required etc.