"Plastic energy."
That's what Bongi Mbonambi described it as.
After scraping past Steve Borthwick's side in the 2023 Rugby World Cup semi-final, the South Africa hooker was scathing of England's back-slapping and celebrating of in-game wins.
By then, it had already become something of a meme. Back row Ben Earl pumping his fist to celebrate Ireland's crooked line-out throw in a pre-tournament warm-up was a particular source of online mockery.
But, while it isn't the diesel grunt that can win matches on its own, "plastic energy" is still something.
It is the body language that shows mindset and intent, that a team's pilot light is on and burning bright.
England had it under Borthwick at the Stade de France three years ago, coming agonisingly close to derailing the Springboks. And they had it in spades in Sunday's 45-22 win against the Wallabies.
Earl, inevitably, was one outlet, loudly celebrating a third-minute scrum success.
But there were plenty more examples throughout the match. Jamie George bellowing into the stands after the opening score; captain Maro Itoje being surrounded with congratulations after an early charge-down; Henry Slade being embraced after a lung-busting late try-saving tackle on Max Jorgensen.
Borthwick needed it all.
A report in the Times newspaper earlier in the week had said that a rift between the players and their coach opened in Argentina in July, at the end of the summer's campaign.
England's senior player denied it. Nothing more to see, they said, than the transparent honesty of a team where input is valued and improvement is the lodestar.
But, they also promised proof on the pitch against Australia. It was a risky gambit.
Another misfiring, disjointed, underpowered performance – like that in their most-recent visit to Twickenham, February's 42-21 defeat by Ireland - would dial up the pressure on Borthwick another notch.
Instead, his fired-up players turned up.
They did so in the obvious ways. There was gainline physicality, breakdown bravery and crunching physicality.
Ben Curry leaping out of the line to land a big hit on fly-half Declan Meredith was satisfyingly old school.
But there was more than that. There was a different sort of bravery – the one that dares to chance the arm, throw a final pass and back ability, rather than take a safe option.
Full-back George Furbank summed it up. Playing his first Test in nearly two years, his ball-playing smarts were summed up by a delicious involvement in Jack van Poortvliet's try, hitting a line, flashing a dummy and smuggling an offload to cut the Wallabies to ribbons.
Henry Slade and Seb Atkinson pulled strings expertly as well.
Immanuel Feyi-Waboso showed the sort of Test match mojo that England must protect at all costs.
The Exeter wing, who, like Furbank, has endured a rotten injury run, was electric in the first half.
Every time the 23-year-old touched the ball, expectation crackled around the stands. And it was mostly met.
