Why the PIA knocking?
I recall reading about a poorly handled (744) asymetric failure just after takeoff of by a US carrier, and the resultant yaw was not at all well handled by the PF, in fact the recovery by the PNF just averted the a/c from something far worse.
If this occured within PIA there would be the old chesnut "poor pilot skills in the third world" etc... and it would be dragged out every so often by (some) ppruners, however, it was a US carrier.
I can't find any references to this now, but I did read about it.. honest.