The Warriors have been brought crashing back down to earth after being thumped 34-18 by the Rabbitohs in their National Rugby League clash in Perth.
The situation wasn't looking so bright for Souths early when tries to David Fusitu'a and Shaun Johnson put the Warriors 10-0 up after just eight minutes.
The Warriors looked on track for victory when skipper Simon Mannering's 50th-minute try gave them a 14-6 edge.
But tries to Rabbitohs pair Walker and Kyle Turner within the space of two minutes swung the match South Sydney's way, giving the 'home' side a 16-14 advantage with 19 minutes to play.
A double to Dave Tyrrell iced the win, with Joel Reddy also scoring during the second half rout when he floated across a pack to take a high grab before crashing over.
The victory though could come at a major cost to the Queensland State of Origin side's bid to win a ninth straight title with star fullback Greg Inglis injuring his knee in the win..
Inglis could hardly walk after his right leg twisted awkwardly under the weight of two players in a tackle-gone-wrong just before half-time.
The 27-year-old was clearly in pain as he limped off and his injury could prove to be the breaking point of Queensland's eight-year Origin domination.
The Maroons are already 1-0 down in the series, meaning the June 18 clash in Sydney is a must-win affair.
With star fullback Billy Slater still under an injury cloud, the last man the Queensland could afford to lose was Inglis.