To be fair, little separated the Storm from the Dragons in the first 15 minutes but the betting agencies' tag of favouritism for the "hosts" began to live up to its billing.
Frankly, the size of the Melbourne forward pack seemed too imposing for their St George counterparts on a dewy surface.
Dragons, such as winger Jason Nightingale, left the field on empty tanks but there was no tolerance for any fairy-tale script endings to the encounter between the fifth and ninth-ranked sides on the table.
Interchange second rower Nelson Asofa-Solomona (28th minute), winger Marika Koroibete (37th), second rower Kevin Proctor (56th) and interchange Mahe Fonua (62nd) did the damage for the Storm with captain Cameron Smith converting three of them.
Dragons centre Peter Mata'utia dived over the try line for an uncoverted one without much pomp and ceremony.
Harris featured in two tries and intercepted a speculator for Koroibete's 40m runaway try from fellow Kiwi international Benji Marshall.
"I just happened to be there at the right time and right place," said the 23-year-old former Tamatea club player, blissfully aware of the fine line players such as Marshall tread in becoming a hero or villain in the blink of an eye.
"We were just lucky to come away [with points] from that opportunity.
"All I did was get the ball as quick as I can to Marika and he's done the rest."
Harris said the St George defence had been among the best all season.
"The boys just kept chipping away and chipping away so we were happy to claim the points."
The former Hastings Boys' High School player said the Storm's focus wasn't on where they were perched on the table but simply treating every game on its merit each round to claim maximum points and that mindset took care of everything else.
"If we prepare and perform to our best then hopefully everything else will take care of itself."
Poker-faced Dragons coach Paul McGregor was ropeable after the officials disallowed Nightingale's try in the 25th minute when Marshall's cut-out pass found traction.
But a hobbling Leeson Ah Mau said: "We just made too many errors and that cost us the game."
On Nightingale's disallowed try, Ah Mau said there were no excuses, although it would have helped their cause, but the Dragons' inability to complete five tackle sets took their toll.
"We were all right there [with defence] for a while and then there were some misreads on defence," said the prop, acknowledging the Storm had put up the shutters.
Storm scrumhalf Cooper Cronk came off with a corked thigh but the coaching stable also took him off to manage his knee as best as they could.
In the only onfield transgression in Napier, Melbourne prop Jesse Bromwich is today under NRL match investigation committee scrutiny for an alleged bite on St George Illawarra player Josh Dugan, among at least five incidents at the end of round 20.
Referee Matt Cecchin put Bromwich on report after the NSW State of Origin fullback complained in the 69th minute, immediately pointing to his arm as he freed himself from the Kiwi test prop's tackle.
