Now I don't know what him was watching. I know what I saw and it certainly gels with cricinfo's account of the dismissal:
13.1 Morkel to Pietersen, FOUR, 87.2 mph, he's going to go for the short ball, this was banged in outside off stump and Pietersen fetches it in front of square
The deep square-leg moves straighter after that shot
13.2 Morkel to Pietersen, no run, 85.7 mph, full outside off stump, Pietersen plays his walking leave
13.3 Morkel to Pietersen, no run, 87.5 mph, nips back into Pietersen and takes him on the thigh pad
13.4 Morkel to Pietersen, FOUR, 87.2 mph, boy, he's got lucky! Another short ball and another pull which takes the top and flies over AB de Villiers. We all know 'it's the way he plays', but...
13.5 Morkel to Pietersen, no run, 87.7 mph, on a fuller length at off stump and defended to mid-on
13.6 Morkel to Pietersen, no run, 85.5 mph, outside off and left alone
15.1 Morkel to Pietersen, no run, 88.4 mph, back of a length outside off and left alone
15.2 Morkel to Pietersen, no run, 86.1 mph, fuller but still outside off, Pietersen just stands there and doesn't play
15.3 Morkel to Pietersen, FOUR, 86.3 mph, decent bouncer but a terrific pull shot from Pietersen as he rolls his wrists and picks the gap between deep square and long leg
15.4 Morkel to Pietersen, no run, 88.8 mph, dropped!, what a wicket that would have been. Pietersen plays a pretty ordinary shot to a rising ball outside off stump, can't get over the top of it to keep it down but Kallis can't take the catch diving to his right at second slip
Would have been the first slip catch of the match
15.5 Morkel to Pietersen, 2 runs, 86.8 mph, on leg stump, worked away in front of square and sprints for second...intense cricket out there
15.6 Morkel to Pietersen, no run, 87.2 mph, good ball to finish with, full on middle and off, defended solidly to the bowler
17.1
Morkel to Pietersen, no run, 87.0 mph, full on off side, driven to mid-off...important that Pietersen settles down
17.2
Morkel to Pietersen, no run, 88.1 mph, a tempting length outside off but Pietersen resists launching into a drive
17.3
Morkel to Pietersen, OUT, 83.9 mph, gone! What a blow. Pietersen cleaned up by Morkel, reward for some top-quality fast bowling. Pietersen caught a little on the back foot and basically missed a straight ball, but the short stuff kept him hanging back in the crease
KP Pietersen b Morkel 16 (36m 17b 3x4 0x6) SR: 94.11