Amir, whose career nearly came to a complete end at Lord's back in 2010 after he received a jail sentence and five-year ban from cricket for his involvement in a spot-fixing scandal during a corresponding Test against England, had taken two wickets for no runs in three balls.
Pakistan team walks off the pitch after taking England´s last wicket on the fourth day of the first worldwide Test match between England and Pakistan at Lord´s cricket ground in London on May 27, 2018.
But the work of team fielding coach Steve Rixon, the former Australia wicket-keeper, was rewarded when Asad Shafiq held a hard catch at second slip edge after Jos Buttler, recalled as a specialist number seven, edged a drive off Hasan and fell for 14.
The left-handed opener, making a record-equalling 153rd consecutive Test appearance, had top-scored with 70 in England's meagre first-innings 184. He hasn't played any red-ball cricket since December. He played a textbook forward defence, the only problem being Amir extracted substantial movement off the pitch to beat his bat and smash into the top of off-stump. Forced to dig in as his partners came and went in quick succession, Root briefly frustrated Pakistan with his 40th half-century in 68 Test matches.
Indeed, their XI for this match has more days of first-class cricket between them this summer than England's - 126 to England's 82.
Captain Sarfraz Ahmed said he would have bowled if he had won the toss and was vindicated by a pace-bowling unit that barely bowled a short delivery and moved the ball, particularly in the air, throughout the day.
The innings ended when Amir held a well-judged catch running back at mid-on to dismiss Mark Wood.
Azhar Ali was 18 not out and Haris Sohail, missed in the slips when Ben Stokes dived across Dawid Malan, unbeaten on 21. It doesn't matter what conditions have been in the last couple of years, they have generally been 100-4 - whether Joe Root is at three or four, whether Bairstow is four, fix or six.
"You've got to try and make it as hard as possible for the opposition. England now have to win every day".
Buttler (66), a limited-overs specialist, and Bess (55), a 20-year-old spinner, displayed the kind of diligence and discipline that the top order lacked to earn England a 56-run lead by the close of play on a lovely day in northwest London.