On the surface, the three don't have very much in common.
Heinen, 21, is in the midst of his first pro training camp, after finishing up his career at the University of Denver back in the spring. Pastrnak - he turned 20 in May - is actually younger than Heinen, but entering his third season with the Bruins.
Backes, on the other hand, has been in the league for 10 years - the last five of which he spent as captain of the St. Louis Blues - and was playing in his first preseason game as Bruin.
That veteran experience was critical to his line on Saturday night.
"A lot of fun playing with those guys, they're such good players," said Heinen, who has now scored a goal in each of his first three preseason contests. "I try to let them do their thing and work hard. It's not that tough to play with those guys.
"Backes talks so much out there, tells you where to be, kind of what he was thinking. And Pasta is just so skilled. Two great players."
It was another step towards feeling at ease for Heinen, who rode the left side for the night.
"Every game I feel a little more comfortable," said Heinen. "I think I was playing with some great players tonight. That made me feel a little more comfortable. I don't know, I'm just going to keep working hard and do what they ask and see what happens."
Heinen got the Bruins on the board just 2:56 into the game. Pastrnak (two goals, one assist) picked up a loose puck high in the offensive zone, before whipping a turn-around shot towards the net. Backes tipped the puck and was originally credited with the goal, but after a review, Heinen was given the goal on a deflection out front to make it 1-0.
Backes was more than impressed with the camp standout.
"The Heinen kid scores a game-tying goal [in the shootout] that's a clutch goal," said Backes, who tallied three assists. "He's counted on in those situations. It's tough at a young age to come through, but he has ice water in his veins and you love seeing that from your teammates."