While batting himself at the end of the Pakistan innings, Wahab was asked by Watson "Is that a bat you're holding?"
It was cheeky stuff from Watson, but hardly a chargeable offence.
While batting it was difficult to see Watson had done anything except stand back and cop the barrage of abuse being sent his way.
Australian officials are at a loss to explain why their hero is likely to face a fine and are yet to be notified.
After the match Watson waited to shake Wahab's hand.
The ICC has pledged to crack down on perceived ugly on-field behaviour, but the umpires last night took two overs of Wahab's intimidation tactics to even step in.
Earlier, the umpires had words with Australian fast bowler Mitchell Starc moments after he sledged Wahab over failing to hit the ball.
