It was a familiar message from the Maple Leafs coach, who was asked how his team could avoid a disastrous period like Toronto had in the third when it was outshot 20-5.
"Stay out of the penalty box," he repeated.
Isn't there more to it than that?
"Stay out of the penalty box," Babcock said. "We were in there far too often. The game was going perfect, we were up 4-1 and then there was a parade to the box.
"Stay out of the penalty box."
Because the Leafs spent so much time killing penalties, an offensive threat like Auston Matthews played the fewest minutes (15:25) since Game 1 (15:24). He played 18:58 in Game 2; 17:11 in Game 3 and 20:52 in Game 4.
Matthews is not one of the Toronto's regular penalty-killers and is often left sitting on the bench when a lack of discipline results in a glut of penalties.
Matthews had 63 points (34 goals, 29 assists) during the regular season. He has a goal and an assist in this series.
"What happens in those situations to guys who don't kill penalties, they sit there and freeze to death," Babcock said. "I don't know if you've ever been out in a snowstorm or been out (snowmobiling) and if your (snowmobile) runs out of gas, you have to sit there and wait for someone to bring you gas. You just sit there, but you're not allowed to walk around because you might stay warm if you do that.
"You're not involved in the game. So what you have done is you take your team out of it and get no rhythm and now you get on your heels. So we have to do a better job of staying out of the box."
The Bruins have scored six power-play goals on 17 attempts in the series, but they went just 1-for-6 on Saturday. Defenseman Ron Hainsey, 37, deserves significant credit for that; he played 8:06 while Toronto was shorthanded on Saturday and has 21:05 of shorthanded ice time in the series.
"We survived," Hainsey said. "We did what we had to do. It wasn't pretty. Way too much time in our own end once we got the 4-1 lead.
"And way too many penalties, obviously."
Babcock couldn't agree more.