"Well, the Charlie Coyle acquisition was precisely to A, solidify third-line center, and then in case of emergency a guy that could move up," Cassidy said. "We had that conversation internally for a long time. Do we have a guy early in the year that could move up? We've plugged guys in there that played well at times, but could they move up in the event of a [center Patrice] Bergeron, Krejci injury."
If Coyle has to move up in the lineup, center Sean Kuraly could similarly move up. Boston would then have to fill Krejci's lineup spot with rookie forward Karson Kuhlman, veteran forward David Backes or a call-up from Providence of the American Hockey League.
Kuhlman has one assist in five playoff games; Backes has one assist in four games this postseason.
"To win in the playoffs, you need every line, every D pairing and both goalies to pull their weight. And everyone's done that so far," Bruins forward Brad Marchand said. "It's the reason we got through the first round and won last night. … So it's great to see that contribution from everybody."
With or without Krejci, Boston heads into Game 2 with a lead in a series for the first time this postseason; it defeated the Toronto Maple Leafs in seven games in the first round despite losing Games 1, 3 and 5.
"Yeah, well, obviously it's a little better breathing in the room," forward David Pastrnak said. "But at the same time it's step one and [the series is] still a free shot. So we're going to look at the positive stuff from Game 1, but we can sleep on the win and we have a new game tomorrow."
Looking forward rather than back was a central theme for the Bruins on Friday.
"Again, regardless of what happens in previous games, there's no indication it's going to happen next game. So you've got to let it go and prepare for the next one," Marchand said.