The first parade at UBS Arena was to the penalty box.
Special teams dominated Saturday's game, with the teams combining for 10 penalties in the first 32 minutes and three power-play goals.
It wasn't in the Islanders favor, as Calgary potted a pair of goals with the man advantage, to the Islanders one. The Flames went 2-for-4 on the power play, while the Islanders went 1-for-6.
Mangiapane scored both power-play goals for the Flames, in strikingly similar fashion, deflecting a pair of Hanifin point shots past Varlamov, the first at 13:18 of the first period to make it 2-0 and the second at 6:43 of the middle frame to make it 3-1.
Nelson's goal did come on the Islanders fourth man advantage of the game, as the center roofed a Richard Panik pass upstairs on Markstrom from the top of the crease. The puck hit off the camera in the net and popped out so quickly that the referees initially waved it off and let play continue.
Nelson's goal also snapped the Islanders 0-for-15 stretch with the man advantage, but even on a 1-for-6 with a new cast of characters, Trotz said he was pleased with the chances.
"When I look at the chances on the power play, we probably had seven, or eight, or even nine," Head Coach Barry Trotz said. "Some nights it's pretty bare so I liked the intensity, I liked a lot of the net-front and the battles to create some of those chances."