SYDNEY: At tea, the home team had stretched its lead to 340 runs at 117 for one, with makeshift opener Usman Khawaja on 30 and skipper Steve Smith not out 25.
The explosive Warner hit leg-spinner Yasir Khan for six, six, four, four in the fourth over of the innings, and then clouted Imran Khan for four consecutive boundaries in the seventh over.
His breathless half-century came off 23 balls with seven fours and three sixes and was the second fastest in Test history after Pakistan skipper Misbah-ul-Haq’s 21 balls against Australia in Abu Dhabi in 2014.
But Warner perished when he missed in a lusty swing and was bowled by Wahab Riaz for 55 off 27 balls.
Younis Khan was left unconquered on 175 as Pakistan lost their last two wickets in an hour’s play post-lunch after rain washed out the first session.
Younis was dropped on 141 by wicketkeeper Matthew Wade, who got his right glove to the chance but could not cling on, much to bowler Mitchell Starc’s annoyance.