Umpires' mistake. A basic umpiring fault. it's not easy for an offspinner to get an lbw against a right hander from round the wicket. Harbhajan tossed this up on off and middle and got it to bite and straighten. AB was forward, but struck around the knee in front of the stumps. Replays suggests that was going over the stumps. The way AB played at that made him look plumber than he should have been - he reached forward instead of front and across and played inside the line. It struck in front of middle.