"I think Sun Tzu said, 'know your enemy' ... So to have an insight in to those guys and particularly the mentality of those players and the group collectively was certainly a big factor for us," said Hurricanes coach Chris Boyd.
He worked under Plumtree for two years with the Sharks but the roles have been reversed in the capital.
The Hurricanes showed an improved defence last year as assistant Clark Laidlaw put better systems in place but Laidlaw is in charge of attack among the backs this season and Plumtree has the defensive brief.
"He's been good," flanker Ardie Savea said of Plumtree. "He's just getting clarity with the players around what our roles are in defence and everything's going well at the moment.
"I think the boys want to take it to another level this year and, if we want to win games, we have to defend our line and defend for a long period of time."
The Lions breached the Hurricanes' line only once and didn't manage a point during the second spell, despite dominating both possession and field position.
"I wouldn't want to try to have to win games with that little territory and possession," Boyd said. "But we were chuffed that we showed good resilience."
The hosts hurt themselves as they missed three penalty attempts during the first spell, and they spurned the offer to take more points in the second as they searched for tries but their handling was poor.
The Hurricanes soaked up the pressure and their bench gave them plenty of punch with Victor Vito and Proctor producing notable cameos.
One thing Boyd wasn't happy about was the number of penalties his side conceded and it was almost as if they tried to break every rule in rugby's convoluted law book.
"Our discipline wasn't good enough," Boyd said. "We are not going to win games if we are ill-disciplined."
They will need to clean up that aspect against the Bulls in Pretoria next weekend but it's always easier to attack that with a first-up win.
Lions 8 (R. Combrinck try; M. Boshoff pen)
Hurricanes 22 (TJ Perenara, M. Proctor tries; B. Barrett 4 pens).
Halftime: 8-11.