Cameron Bancroft is questioned by umpires Nigel Llong (left) and Richard Illingworth during the third Test v SA on Saturday. Pic/AFP

The umpires' conduct has been extraordinary. No five-run penalty. The ball was not replaced, even when they saw the footage during the tea interval. How can this possibly be? The five-run penalty is not something that is awarded if the ball starts to swing round corners. It should be awarded if there is clear evidence of tampering, regardless of whether it was effective or not. Likewise the change of ball. Why did they not follow the rules?