Cauley Woodrow scored a 102nd-minute penalty as Barnsley drew 2-2 at home to Championship leaders in their first game of the post Gerhard Struber era.
Woodrow fired in with the final kick of the game after Michael Sollbauer had to receive treatment on the pitch for about seven minutes before being stretchered off. He had been fouled in the air just inside the box by Callum O'Dowda.
Michal Helik headed the hosts in front after 65 seconds with his first goal in English football but the visitors scored twice through deflected shots in four minutes at the start of the second half.
The Reds have now collected two points from their first five games of the Championship season.
Jack Walton, Romal Palmer, Conor Chaplin and Clarke Oduor returned to the starting line-up in place of Brad Collins, Dominik Frieser, Callum Styles and the departed Marcel Ritzmaier.
Barnsley would have set a new club record for the longest wait for a league goal from open play in a season if they had not scored in the first six minutes. But Helik rose highest in the second minute to head in a right-wing Palmer corner at the back post.
Woodrow – who had signed a new contract the previous day amid talk of a move to Cardiff City – had almost scored after 28 seconds when a Jordan Williams shot went into his path and put him clean through on goal. A defender did well to block his shot eight yards out which led to the corner from which the hosts scored.
The visitors nearly levelled through two right-wing corners by Tommy Rowe in the first seven minutes, with Andreas Weimann heading the first just wide then Taylor Moore lofting a header into Walton's hands. Chris Martin then headed wide a few yards out on the left at a very tight angle after former Barnsley loanee Jack Hunt's shot was deflected high into the air.
Luke Thomas saw a low 25-yard shot saved then goalkeeper Max O'Leary also denied Woodrow with a shot from the right of the box.
The visitors should have levelled on 39 minutes when Martin's header put his strike partner Nahki Wells clean through on goal but he touched it wide to his right then, although his shot beat Walton, Jordan Williams cleared it off the line.
Barnsley could have bookended the first half with goals from right-wing set pieces but Sollbauer's difficult headed chance from Chaplin's free-kick was put straight at the goalkeeper.
The visitors levelled on 47 minutes. Wells swapped passes with Weimann to unlock the home defence and was free to sprint into the box from the left and have a shot which Walton saved well then did even better to keep out the rebound from the same player. Helik blocked another effort but the ball eventually went to Hunt on the right who smashed in from 15 yards, via an apparent deflection off Mads Andersen.
The next goal came on 51 minutes when Wells' shot from the right of the box was palmed away by Walton but Tyreeq Bakinson's shot from the edge of the box took a big deflection off Jordan Williams and trickled into the bottom right corner.
Murray brought on deadline day signing Herbie Kane for his debut and then Elliot Simoes. Hunt fired straight at Walton from 30 yards then Thomas blasted high and wide from just outside the box.
The visitors almost got a third in added time when Callum O'Dowda's cross was headed down by Weimann to Zak Vyner whose power 20-year effort was saved by Walton diving to his right. The fourth of four added minutes had just finished when O'Dowda clattered Sollbauer in the air and a penalty was awarded which Woodrow scored.
Barnsley: Walton; Sollbauer, Helik, Andersen; J Williams, Mowatt, Palmer (Kane 56mins), Thomas Oduor (Simoes 64); Woodrow, Chaplin (Frieser 78)
Subs: Collins, Brittain, Christie-Davies, Kane, Simoes, Schmidt.
Yellow cards: Andersen, Helik.
Goals: Hellik 2, Woodrow 90+12 (pen)
Bristol City: O'Leary; Vyner, Moore, Mawson; Hunt, Bakinson, Paterson (O'Dowda 85), Weimann, Rowe; Martin (Kalas 79), Wells (Semenyo 74).
Subs: Wollacott, Sessegnon, Massengo, Diedhiou.
Goals: Hunt 47, Bakinson 51.