In the last try of the game, Perenara, who had come on as a substitute to play first five-eighths, made the initial break before finding wing George Bridge with a pass. Bridge brought the ball slightly infield to take a tackle. Replacement centre Rieko Ioane cleared the ball to replacement halfback Brad Weber.
Putting his speed to use he moved downfield and just before a tackle, he passed, behind his back, to Perenara who was supporting outside him on the touchline.
With little room to move, Perenara set sail for the corner flag and while tackled short of the line he managed to ground the ball in the corner before being pushed out.
"It's just instinct," Perenara said afterwards.
"I was just trying to have a jam and I was lucky enough to get the ball down.
"It was fun being able to get the ball in a little bit of space is always good.
"We [he and Weber] had a beer or two in the dressing room afterwards for setting me up. It was pretty cool.
"To be fair I was telling Webby when Jordie [Barrett] was taking the kick that if we were in different positions then I was passing him the ball. He's probably that quick that he runs the ball around and puts it under the sticks and we're not having this conversation.
Perenara said managing to draw a fist pump out of coach Steve Hansen was a big outcome for the try.
"He's cool, calm and collected and he doesn't show a hell of a lot of emotion. I haven't seen it actually but I'll have a conversation with him about it," he said.
Namibia had played very well, he said. They attacked and defended well, they slowed the ball down, got some penalties and were sharp with the ball in hand.
Captain and lock Sam Whitelock had his own version of events.
They had been in a huddle and the word was to finish strong.
"TJ was pretty excited, he was like 'Yep, if there's an opportunity let's really go for it' and then obviously a couple of halfbacks linked up and I'm not sure how he got it down but it was pretty impressive."
Assistant coach Ian Foster said it was probably the coaching team's fault because they put two halfbacks on together so mayhem was always going to happen.
"I take my hat off to them. TJ actually made some really good decisions and Brad provided a special little moment with that pass so obviously the scoreboard enabled them to express themselves the way they wanted and we got away with it," he said.