Professional job by England to make short work of the tail and mop up the rest of the SA order. Broad is bowling excellently, he really is. He has always been somebody who seems to over-deliberate and think too much about his deliveries during his run-up, but he seems to be performing naturally now.
He spoke yesterday about how he feels at the height of his powers, and he definitely is in red-ball cricket. It's telling that Anderson has been absent for his best performances in an England shirt this year, which suggests he's ready to step up when the latter retires and calls it a day.
I think he still has something to offer us in white-ball cricket, especially ODIs, but when he's in this sort of Test form, there's every sense in keeping him for red-ball cricket where he can unleash the ultimate amount of carnage on the opposition.
We'll definitely look back at this era of Broad as his pomp.