McAvoy drew high praise from many of his teammates, who were no doubt happy to see him shoulder such a large load, especially down a defenseman for over half of the game.
"He did a great job for a young player coming into that situation," said Adam McQuaid. "He played a ton, and I think sometimes, that can be a good thing. You don't have to think as much."
"It was impressive," added Bergeron. "You would think it's a lot of pressure coming in like that as a 19-year-old. His first game is the first game of the playoffs, it's not easy to do."
"There's not much you can say about his game other than that he was phenomenal last night."
Cassidy also pointed to players like McAvoy and David Pastrnak providing a youthful exuberance around the dressing room that can rub off on the veterans.
"Those are the guys you want in your lineup that want the puck when the game's on the line or in big moments," said Cassidy. "The more of those guys we can grow and develop and integrate into the lineup, the better off we're going to be. It rubs off on the older guys. You ask any veteran player, they see these young, youthful guys that have no fear when the puck drops, it's only going to make them more energetic.
"Just like their leadership will rub off on the young guys, their energy rubs off on the older guys."
Amid all of the hype leading up to his highly anticipated debut - with his parents in attendance - McAvoy made sure to set aside a couple moments to soak the atmosphere and moment in.
"I kind of did take a look up and saw the building that we were in, with so many fans, it was really packed tonight and loud. It was pretty special," said McAvoy.
"Overall, just an amazing experience tonight."