"I had no clue,'' he admitted. "Every day down in Stockton just trying to put in the work for this moment. Definitely it's great to get that call and I've just got to make the most of it."
Mangipane is further evidence of a developing pipeline between the Flames and their AHL affiliate, becoming the fifth player to be called up this year.
"That's one thing we talk about all the time," emphasized Flames' assistant GM Brad Pascall. "You're being talked about. You're not a forgotten soul.
"Because they can get that impression.
"We always try to have communication with (Stockton) and spend a lot of time down there, one of us. Myself, Burkie, Craig (Conroy), Brad (Treliving).
"You know Mang is a skilled guy, back-to-back 100-point seasons in the Ontario Hockey League. He just continues to evolve as a player. Other than his skill, what stands out is his compete on pucks, winning those 50-50 battles. Tenacious.
"This guy battles around the paint, isn't afraid to finish checks. He wants the puck. Ask Janko. For his size he battles hard."
Mangipane arrives for the 7 p.m., pre-streamers and resolutions, with the Flames endeavouring to kick the New Year off in style.
"It's a well-earned call-up,'' said coach Glen Gultzaan. "From a strong training camp, put him down there with Janks and Hath, playing well. Take Janks out, still playing well. Take Hath out, still playing well."
That NHL bow game is always special. No matter where, for who, or the circumstances.
"I phoned my parents first,'' Mangipane reported. "They were just ecstatic, a couldn't-believe-it type thing. I let all my family members know, cousins, all my friends … I couldn't be any happier.
"I think they thought I was lying to them. Just an amazing experience.
"I gotta keep it simple, right? Play with confidence. Just play my game.
"Simple.
"I think I'll have lots of energy tonight. I'm excited to be here. Just brings that to the table, be myself and play the game I know how to play."