The Sharks allowed two power-play goals on two opportunities in Game 6 and surrendered five on 15 chances in Games 3-6. Before that, they had killed 32 of 34 penalties in their previous 11 games and were 6-for-6 in the first two games against the Blues.
San Jose also struggled on the power play against St. Louis, finishing 2-for-13.
"We didn't have as many opportunities, especially in the last three games," Kane said of the power play. "At the same time, I don't know if the urgency was there necessarily. They don't give you much. They take away a lot of those seam passes. We just didn't get enough pucks on goal."