The ball must not pitch outside the line of leg stump.

The source is obviously the infection in his leg stump.

Hawkeye shows the ball heading a couple of inches over leg stump.

The ball pitched in line and would have gone on to hit well up leg stump.

That was very close; it might just have been bouncing over leg stump.

Hawkeye shows it was hitting the outside of leg stump.

Once more he struggled to maintain a line that did not drift towards leg stump.

Then he inside edges a full, curving delivery wide of leg stump for four more.

He let the next ball go by outside leg stump.

He took a fairly long run for his time and could make the ball move away from leg stump to off with great effect.