In the 97th minute of the contest, Brisbane goalkeeper Michael Theo tangled with Dylan McGowan.
Having thrown an elbow in the direction of his opponent, Theo was subsequently shown a red card.
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With the incident having occurred inside the penalty area, a spot-kick was also awarded against him.
The Roar had already used all three of their substitutes by that stage, forcing midfielder Thomas Kristensen to take over between the sticks.
