He wasn't the only one preaching caution.
"Let's not get ahead of ourselves here," defenseman Torey Krug said. "It's one game. It's about sticking with the process and obviously we've tweaked some things and guys responded well. At the same time, it's one game, so we have to continue to do our jobs and do it well and do it to the best of our capabilities, and we'll end up winning a lot of hockey games."
But even with that caution, for the Bruins, it was good to start out this way, good to return to a celebration at the end of the night, instead of the all-too-frequent disappointment.
Before the game, Cassidy admitted to not being nervous exactly, but to being curious. What would the Bruins look like under his tutelage? What would the team become? Would anything change in his first game as coach?
He got his answer, even if that answer is incomplete. One game does not fix all that the Bruins need to fix. But it was a win, and a good one, and it bought Cassidy time to exhale.
"It's been a busy two or three days, so I'll tell you this: I'm going to sleep well tonight," Cassidy said. "But tomorrow's a new day. We'll get back to work and see if we can build on this one. But yeah, who doesn't enjoy a win?"