The former England star's sweep almost collected the security guard, who began running off before losing his hat, forcing him to track back embarrassingly before finally heading back towards his spot outside the boundary rope.
The Channel 10 commentators couldn't believe their eyes.
"Oh look out it's going to hit the security guard!" said Mark Waugh.
"I reckon he's tried to hit him there."
Mark Howard was equally as perplexed.
"What's he doing out there?
"It's like those lunatics that run onto the grand prix track."
Normally Pietersen is the man everyone's talking about when he's got a bat in hand, but for once someone managed to overshadow him, even though he had absolutely nothing to do with the on-field action.
The bizarre incident wasn't missed by those on Twitter.