Gregory Fisher-USA TODAY Sports

Mitch Wishnowsky had what would have been the play of his life cruelly taken away by penalty in the San Francisco 49ers' Week 14 win over the Seattle Seahawks.

But that didn't make it any less impressive.

Punter Wishnowsky stunned everyone, including his own team, when he made a split-second decision to fake a punt during the third quarter.

Wishnowsky surged 30 yards up the right sideline to the Seattle 29-yard line, with a late hit out of bounds seemingly setting the Niners up on the Seahawks' 14-yard line.

However, that flag against Seattle was offset by a personal foul against rookie receiver Ronnie Bell, who was penalized for an illegal block below the waist after appearing to slip and take out the legs of a Seahawks defender.

That wiped away an incredible net gain of 45 yards, with Wishnowsky's explosive play that never counted made all the more remarkable when Kyle Shanahan revealed the speed he reached on the run.

Asked if he called the play, the 49ers head coach jokingly replied: "I just knew that it would work good right there. So I just called my first fake punt.”

"I don't know if he thought it was going to get blocked or if he bobbled the snap a hair or he just had a glitch, but it was a good one because when he paused and stuff and saw the edge, it was obviously a clean look and he didn't hesitate for it. 

"I was just told he hit over 20 miles per hour on it. So that's real cool. I know Ronnie felt bad about it, but wish we could have avoided that."

Speaking to reporters in the locker room, Wishnowsky revealed there was very little thought behind his decision.

"I winged it," the Australian said.

"I just sort of looked and saw that the whole rush team had crushed down on the protection and it was open, so I just ran."

There's no doubt Wishnowsky can run, with his speed, officially recorded as 20.13 miles per hour by NextGen Stats, astonishing tight end George Kittle.

"Did he really? Bull..." Kittle said when told what number Wishnowsky reached.

"You know what? When you have a punter, it’s the hair. It just flies in the wind."

All-Pro left tackle Trent Williams was similarly amused, adding: "I loved it. We didn’t even get a heads up on it on the sideline. 

"We’re over there getting ready to corrections and all I see is the Australian striking down the sideline. Unfortunately it was some bull**** penalty but love to see the Australian out there opening that stride out."

The 49ers probably won't call Wishnowsky's number very often going forward and likely won't want him to make improvisation a regular feature of his game. However, having shown his athleticism in the open field, the 49ers now have another unexpected weapon in their massive arsenal.

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