But it seems clear he has put any struggles behind him.
"Well, obviously he's feeling it," Cassidy said. "He broke through in Washington late, had plenty of opportunities, so that was the good news. It was only a matter of time. That line's really humming.
"Right now, he's going. Goal-scorers get hot sometimes. He had a spell there where it didn't work out for him, particularly on the power play. Now he's finding some ice and his shot's going in. Good for him."
That, Cassidy said, is what the Bruins need: the goals to go in, the confidence to start increasing. For Pastrnak to be Pastrnak.
And if he's feeling good, like he was Saturday, there are a few more suit choices left in the closet as the series moves along.
"It's more like motivation," Pastrnak said. "You need to play good. I like fashion. It was the boring one today that I decided compared to what I was going to wear. And then at the end, I kind of backed up a little bit, decided to go with this one.
"Still have a couple crazy ones in the closet. Hopefully I'm bold enough to wear them."