It's very difficult to dictate play for a full game. The other side is going to have moments when momentum is on its side. But in the vast majority of games so far this season, the Lightning have had long segments in which they've applied heavy pressure. So heavy, in fact, that they've virtually overwhelmed their opponent. Essentially all of the action takes place in the other team's defensive zone and the opposition, at best, can only manage a momentary clear before the puck comes back in. The Lightning have literally imposed their will on their opponent. This was most pronounced during the Lightning's record-setting second period in Chicago on October 21st, when they posted an NHL-record 33 shots on goal.
The very best lines in the league are capable of doing this to the opponent, but the Lightning, thanks to their capacity to roll four lines that can maintain momentum, are the rare team that can sustain it over an extended period of time.
Doing this does not always guarantee victory. On November 13, Buffalo goalie Carter Hutton negated the Lightning's flow-of-play advantage with an outstanding performance and the Sabres won, 2-1. As mentioned earlier, Vasilevskiy was the difference in Thursday's game against Toronto, a rare instance this season in which the Lightning weren't able to impose their will on their opponent.
But those games are usually outliers. If you decisively outplay the other team, you're going to win more often than not. And the Lightning have done it in spectacular fashion. Now, they'll try to maintain it as they begin one of their toughest stretches of the regular season. Beginning with Sunday's contest in Winnipeg, the Bolts will play seven of the next nine on the road, visiting both Western Canada (plus Winnipeg) and California in the process.