You are doing injustice to him - first he batted at 62 SR, not 42 (first innings it was 100+), so the killer instinct was there.
Key point in both innings you have missed the key point - those were double swing ball. It first moved away in air, then came back off the seem - hence for our dumb eyes, it looked like PAK Captain is castled by absolute cannon fodder straight one in both innings - that too with 30 overs old ball. But, in reality, those were unplayable balls, Sarfraz is unlucky to miss couple of jaffars.