And it's about doing that for 60 minutes, for the entirety of a game, not just part of it.
Rick Nash, in particular, has had trouble finishing on his chances. He was the only regular to skate alongside the scratches and extra players at Warrior Ice Arena on Sunday before the flight to Toronto.
Nash came into the Stanley Cup Playoffs having missed the final 12 games of the regular season with a concussion, and it's not entirely clear whether he's completely back from the layoff.
"The puck is finding him because he's smart, he's fast and he's got good hands," Cassidy said. "Just that finish. This time of the year you need a little more oomph on it at the end. Everything's falling into place except the last piece, which is getting it by the goaltender. So hopefully it happens for him.
"The good part is the puck is finding him. That's problematic for offensive guys when the puck doesn't find you. That's when you know you're not right. So we're going to continue to stress the importance of getting in the right spots. Now it's just a matter of hopefully getting it past the guy."
Secondary scoring was less important in the first two games because Bergeron's line piled up 20 points (five goals, 15 assists) and the Bruins went 5-for-10 on the power play. But it has become more crucial, as the Maple Leafs have made adjustments and been able to concentrate more on stopping Bergeron's line, and will be even more important the deeper the Bruins go into the playoffs.
For now, it's about correcting the issues, the step or half-second slow they seem to be, the inch or two away they seem to be, finding the finish that will allow them to contribute and push the Bruins into the next round.
"We've been pretty nonexistent, I think, to this point," Riley Nash said of his line. "I think the fourth line has done a really good job chipping away. I think we can probably take a couple lessons from what they're doing, throwing it in deep, outnumbering their guys and just getting to the puck.
"I think doing that, just simplifying our game, would help a lot."