“We have, at times, lost momentum and had to gain it back,” O’Reilly said in the Garden on Tuesday. “We have done a great job of that. Our veteran guys who have played a lot of games, we lean on them. We are confident. We know what we have to do. We know what our best game looks like. It all comes down to this. We leave it out there.”

They reset after defeats, often looking their best after their worst. They have turned the road into their home. They have lost and gained back so many times now, they simply forgot about the Game 6 disappointment we spent hours dissecting.

Back to the road, where they have won nine of 12 games this postseason. Back to Boston, where they have won two straight. Back to having their backs against the wall, where they are comfortable enough to smile — and mean it.

“We have been the underdog in, if not all of, then most of the series in the playoffs,” said Carl Gunnarsson. “We are kind of used to that a little bit. We have shown ourselves and everyone else that we can beat anyone. We can come back. You can never count us out. That’s the strength of our team.”

A confidence that bloomed in coach Craig Berube’s Blues in January has been enhanced in the spotlight of the playoffs.