Blues goalie Jordan Binnington made the save and covered the puck, but after the play was whistled dead, Binnington wrapped his arms around Byfuglien's leg. The ensuing scrum resulted in roughing penalties to Byfuglien and Blues forward Brayden Schenn at 7:18.
"It was a little bit of a mix up there," Binnington said. "There was a little traffic in front. It happens, playoff hockey."
Byfuglien said he was trying to use his big body to make life tough for the Blues goalie.
"No one really likes traffic," he said. "Just get bodies and traffic in front of him and I think every goalie just hates that, so it's about being around there. Why he grabbed on, I don't know. But it was different. So it's just little things, trying to get in his head maybe."
Binnington's head was the focus when Byfuglien scored his goal at 8:06 of the third period to extend the lead to 5-2.
Byfuglien skated around the Blues net and above the goal line before cutting back to elude defenseman Colton Parayko. From along the end boards, he fired a quick, high shot that struck Binnington on the side of the mask and deflected into the net.
"It was just the way he was leaning," Byfuglien said. "If you look, he was off his post a little bit and you can kind of see the room. It's one of those things that you try to do and hope it goes in."
Plays like that have given the Jets confidence as they attempt to advance past the first round for the second straight season.
"He's a special athlete, for sure," Maurice said. "He's an impact guy and he's rare. To be that physical and that strong, and he's offensively gifted, so when he's going, you've got a much better chance of winning."