Brisbane's premiership defence hangs by a thread after they were handed a sixth-straight NRL defeat in a 48-6 thrashing at the hands of South Sydney.
Five-eighth Cody Walker was the mastermind behind the Bunnies' victory on Thursday night as Wayne Bennett's side (7-6) strengthened their bid for a top-eight spot.
Walker had four try-assists and Alex Johnston grabbed a quartet of tries as Souths snapped a three-game winless run.
But the story of the night will be Brisbane's nosediving form as they returned to Accor Stadium for the first time since coach Michael Maguire engineered a drought-breaking premiership win nine months ago.
The Broncos began their losing run with defeats to top-four contenders in the Sydney Roosters, Manly and the Warriors.
