Marnus keeps on making runs for fun.
Marnus has been the key here for me, even moreso than Warner. The way he left the ball in this mornings session was outstanding and IMO the 1 thing that swung this innings (again even moreso than Warner being bowled on a no ball) was the Root "drop" (I'll call it that because it should have been caught) when he was standing at least a metre too deep. Marnus doesn't give many chances and when you get a chance to get him, you just have to take it which Root didn't. I think he was on about 15 at the time.
The reason why I think this was more important than the Warner one, is because having Marnus play that role (and Smith too) is it gives Warner so much more freedom to play aggressively. Getting Marnus and Smith cheaply is the most important thing to do when playing the Aussies.
England have bowled better than the scorecard shows, but within that you have to give credit to the batsmen too, particularly as I say for Marnus, his reading of the ball and in particular the length was outstanding.