Pakistan coach Dav Whatmore conceded that the South African attack was far too strong for his overwhelmed tourists who were dismissed for a paltry 49 on the second day of the second Test at the Wanderers.
The innings lasted just 29.1 overs, with only two visiting batsmen reaching double digits as the hosts took complete control in Johannesburg.
Dale Steyn claimed 6-8 in 49 deliveries and, by close, South Africa had moved 411 runs ahead with seven second innings wickets remaining.
Whatmore said: "I have never seen two hours of such relentless attack, it was incredible pace bowling.
"Most of our batsmen were out to terrific balls. I think we scored something like 34 runs in the first session? It is unheard of."
As for Steyn, Whatmore added: "His pace and skill on this pitch is what makes him so special.
"I am obviously unhappy with the result of today but there were reasons for it. It was incredible bowling."