In the final minute of the first period, Schneider stopped Blake Comeau from close range and then blocked three shots in succession, by Bouwmeester, Jarome Iginla and Tanguay, to keep it scoreless.
Kassian opened the scoring 6:20 into the second on a good third effort. He intercepted a Calgary hand pass, retrieved the puck after his first shot was blocked and then fired it home. It was Kassian's second goal of the season.
"I kind of got lucky," he said. "The puck kept coming back to me, and finally I whacked it into the back of the net. The third time was the charm."
Raymond put the Canucks up 2-0 on a power play exactly 2 minutes later.
Tanguay pulled the Flames within a goal at the 11-minute mark as he clanked a shot in off a goalpost. It was only Calgary's third shot of the period, while the Canucks had 15 in the period at that point.
A little while later, Schneider got his pad on a puck during a scramble to deny the Flames. A video review upheld the referees' decision that the puck did not go in.
However, Calgary tied it as Vancouver took three penalties in a span of 2:17.
During the stretch, Calgary had a two-man advantage for 1:03 but could not score, and then had another one for 41 seconds. Again, the Flames were denied, but Alex Edler continued Vancouver's penalty string by closing his hand on the puck.
With the Flames enjoying a man-advantage opportunity, Backlund beat Schneider with a shot low to the stick side.
"I thought we had really good momentum, good control of the game until that time. Not only did they get chances, but they got momentum off that," Vigneault said.
The Canucks got their sixth power play of the game with just under 6 minutes left as Blair Jones was sent off for tripping Chris Tanev into the side boards. But Vancouver could not capitalize and had to endure overtime and a shootout for the second straight game.
NOTES: Canucks defensemen Cam Barker and Andrew Alberts were scratched for the third straight game. ... Calgary center Jiri Hudler remained out on bereavement leave following the death of his father. ... Flames defenseman Chris Butler and center Roman Horak were scratched after playing the first two games of the season.