Smith, who had turned his head away from the lifter, took a couple of minutes to recover, squatting on his haunches as he regathered his wits.
It was a statement of intent, and served its purpose.
Smith looked shaky, surviving one lbw appeal from Bracewell on six.
The appeal failed because of a clear overstepping of the front crease, a problem which has troubled Bracewell.
Throughout the session Smith was clearly not his usual assertive self, and was fortunate to get to lunch on 40.
If all wasn't well with the lefthander it wasn't great outside the ground either.
A ticket system crash left spectators queuing for 50 minutes to get into the ground.
At the toss -New Zealand having decided left arm spinner Bruce Martin would be out of the 12 named yesterday - the tourists were probably happy with the outcome.
Smith chose to bat; New Zealand skipper Brendon McCullum said he would have fielded first.
Nightmare visions of his batsmen being put under the hammer again by South Africa's top class quicks may have flashed through his mind.
But there was also a practical reason he'd have opted to field. There was a breeze from the south west, usually regarded as a bat-first, drying breeze.
But New Zealand left armer Trent Boult relishes a breeze to help his inswing to the righthanders, and he locked onto a tidy line.
Cape Town century-maker Alviro Petersen looked secure, unfurling one superb off drive from Bracewell which rocketed to the boundary.
But he departed to the final ball of the 10th over after trying to hook Bracewell from outside his off stump.
The ball flew straight to Jeetan Patel running in at fine leg.
Neil Wagner, recalled for his third test, was crunched through the covers by Smith, although Hashim Amla miscued one shot which flew just wide of mid on.
Wagner was unlucky, Smith edging wide three times of the slips to the fence. In between, he tumbled to the turf on his follow through four times.
Offspinner Patel was on for the 16th over straight after the drinks break, and was immediately swept hard for four by Amla, who was looking solid on 32.