After he should have potentially been dismissed in the first half for a rash challenge, the Chelsea loanee had the chance to grab the three points for the 'Magpies' right at the death.
Newcastle looked to push for a victory with Japanese forward Yoshinori Muto down the left flank, who crossed the ball in for it to be blocked by Sean Morrison with his arm.
The referee Craig Pawson noticed the foul in the box and pointed to the spot, giving the winger the chance to give Newcastle a dramatic late victory.
However, he stepped up to take a very poor penalty that was easily saved by Cardiff keeper Neil Etheridge to his left and squandered with it the oppportunity for Rafa Benitez to get his first win of the new season.