"We talked at halftime about shortening it up and we scored a really nice try with close passing, but then we decided to take the elements on. We wanted to do a lot more kicking and chasing but for whatever reason we didn't do it."
In a match in which Canada showed dominance in the scrum and a zest for work around the ruck, it was Rule that proved the difference.
Many times she bought her side time by being strong in the tackle or taking the ball back into traffic instead of shovelling it wide, with Canada clearly lacking the same punch in the midfield to go with the rapid back three of Jessica Dovanne, Magali Harvey and Elissa Alari.
Rule's first half effort, coming on the back of a number of phases, showcased her power on the outside, while Winiata's well-timed run to the corner came off her right shoulder after a break with three minutes to go.
Canada thoroughly deserved their try through centre Mandy Marchak and will take plenty from the match ahead of Saturday's second test in Whakatane.
Black Ferns 16 (Selica Winiata, Amiria Rule tries; Kendra Cocksedge 2 pens) Canada 8 (Mandy Marchak try, Magali Harvey pen)