Not only did it give Prior and England a life, but it also changed the momentum of the game from that moment on.
Time will tell whether the "dismissal" of Alastair Cook proves to be as significant, but the potential is there for England to make debutant Michael Beer pay for his no-ball wicket.
Not only have Australia paid the price for his overstepping the mark, but Beer will also be ruing his missed opportunity for a first Test scalp.
After a nervous start against the rampant Kevin Pietersen, Beer's day, and maybe career, took a step forward when Cook mis-timed a lofted drive to mid-on on 46.
Johnson sympathises with Beer
Much to the delight of a vast section of the crowd, the Australian players and Beer himself, the Test match had taken a turn for the better.
That is, until Billy Bowden asked the third umpire for a front foot ruling.
The cameras confirmed a no-ball and at stumps Cook remained unbeaten on 61.
After another tight day of Test cricket the stage is set for this battle to continue.
The pitch looks competitive and Australia have three English players back in the changing room but much work is to be done for either team to claim honours in this final Test match.
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