Amir claimed in the interview with Sky Sports that since he hardly ever over-stepped in his career, therefore, he had to practise it hard before doing it in the Lord’s Test. He was right, because in his first six Test matches he bowled only two no-balls collectively. Later, between the above mentioned Australia Test and the Lord’s outing, he again remained steady and went over the popping crease only five times in six Test matches.
Only twice in his 14-Test career, Amir’s over-stepping was glaring —against Australia in 2009 and against England in 2010. So no points for guessing why ‘Ali’ and Mazhar Majeed could blackmail Amir on something which had previously happened between them on the Australian trip.
I can even say this much that all three were aware of the truth and there was evidence in the form of text messages between them too, so Amir got frazzled and delivered the no-balls on their instructions.