It may be that Root had been excited by the advent of a harder ball, in a highly eventful over. To the first ball Root played a sumptuous drive to the long-off boundary; the second took his inside edge and raced to the fine-leg boundary. England closed on 233 for five, not the worst score, but the impetus was undoubtedly with Australia. Until the second new ball Root had methodically bided his time, just as Smith has done throughout the series. After 19 Test innings Vince averages just under 23, which is a mystery.
Source: The Guardian January 04, 2018 08:38 UTC