It was their mindset more than anything else.
"Our mentality was we wanted to outscore them instead of build the lead and then shut them down," Cooper said. "When you have the mentality that we want to outscore teams, these are the things that can happen. Our mentality has to be, when we get into these situations, to shut a team down, not to pad the lead."
The Lightning tried to throw a knockout punch in Game 1 when they should have tried to win without any theatrics to take command of the series.
They had a 3-0 lead and they should have protected it by making simple, smart plays, like getting the puck deep and going to work on Columbus' defensemen.
It's not about going into shutdown mode, backing up and protecting the net at all costs. It's more just managing the situation.
Killorn said the Lightning subconsciously thought they could score more because the first three goals came relatively easy and pouring it on is what they did a lot in the regular season, when Tampa Bay won a League-high 30 games by three or more goals.
"It can't be that mindset in a playoff atmosphere where it's tough to score goals and momentum shifts can change games so quickly," Killorn said. "We have to be more aware of that and we have to realize we're up 3-0, we don't need to score another goal to win the game. We have to protect that lead."
A glaring example of what they did wrong was the ill-advised play that helped set up the Blue Jackets' first goal, with 10:45 remaining in the second period.
Lightning defenseman Ryan McDonagh, instead of putting the puck behind the Blue Jackets goal line and creating a cycle situation that could have tired the Blue Jackets and potentially led to a scoring chance in the slot, tried a cross-ice pass to defense partner Erik Cernak. Columbus forward Josh Anderson had a good stick in the lane, tipped the pass and center Nick Foligno pounced on it, going in for a breakaway goal to cut the deficit to 3-1.