"[Henrique] made a great play to keep the puck below the goal line, and Hall gave me a great pass," Hischier said. "I just had to finish."
Mrazek, who was shaken up in the collision with Henrique, was replaced by Jimmy Howard after the goal under the League's concussion protocol.
"I know the rule, but I didn't have any pain in my head," he said. "I just lost my breath for a little bit."
Mrazek stayed in the game for 2:16 between the collision and Hischier's goal.
Mantha made it 3-2 at 6:50, beating Kinkaid to end a four-game point drought, and Booth tied it 3-3 with his second of the game at 8:16.