That is, before he threw off his suit jacket and rushed up to finish his bartender shift at SportsDeck, the arena's sports bar.
Angilly, who is a probation officer during the day and tends bar at TD Garden, is a trained opera singer and one of the finalists the Bruins chose to perform this season. Longtime Bruins anthem singer Rene Rancourt retired after the 2017-18 season.
"I'm shaking right now," Angilly, 43, said. "The only reason I say this is to make the point. I've studied at the New England Conservatory and all that stuff. I've been on stages. But this is different. This is a whole different [thing]. Yeah, I'm still buzzing. It's really weird. There was a couple times out there I thought I was going to start yelling or something because they were really getting into it."
Angilly, a Warwick, Rhode Island native who lives in Lynnfield, Massachusetts, has filled in a few times before at Bruins games and has performed the anthem at Boston Red Sox games at Fenway Park, but performing before the Bruins' home opener was extra special.
"I've done a bunch of others, but this one is … it's playing in your head," Angilly said. "They did a great job. I'll be honest with you: Somebody asked me if I thought I was going to get boos and stuff and I kind of expected that because they want their guy. Bruins crowd, they were so good about bringing me into it and they sounded great. They were into it, got me into it."
Once Angilly got done singing with his SportsDeck uniform under his jacket, he went back to work.
"They're all waiting for me," he said.
Because he's one of several finalists, Angilly isn't sure how many more times he'll be singing the anthems, but he'll be ready behind the bar when the call comes.
"They can come down and get me whenever they need me," he said.
NHL.com staff writer Amalie Benjamin contributed to this story.