The 22-year-old winger also picked up an assist on Krejci's first goal, which tied the game at 1 with 5:13 left in the opening period, before adding a second helper on Krejci's second of the night in the final minutes.
"First period there he cut off the wing, something we hadn't seen much in a while, went to the net," said Cassidy. "He's a streaky guy. He's still young, so I think it affects him mentally if you're not on the scoresheet. I think, hopefully, it's a sign of more, but we'll see."
DeBrusk, a natural goal scorer during the entirety of his hockey career, admitted to being frustrated in recent weeks with the puck staying out of the net. But something clicked on Tuesday night, with the winger saying, "just tried to play hockey and have fun with it no matter what happened."
A fine approach, indeed, as DeBrusk landed a game-high five shots on goal in 15:18 of ice time and played with his patented jump and speed.
"It actually got to me a little bit, but at the same time I understood that there are peaks and valleys to your seasons and that what doesn't kill you makes you stronger," said DeBrusk. "And when you get through it, it's going to be a lot of fun and hopefully I've gotten through that.
"Obviously, going into the next game - it's a different game don't get me wrong - but for the first time in a while I'm feeling good right now."
With Pastrnak out for the foreseeable future, the Bruins hope their pair of young wingers feel that way for the duration.