It was his second goal of the season.
Unfortunately, the Lightning answered right back with just seven seconds remaining before the intermission on a goal by defenseman Braydon Coburn to tie things up 1-1.
Captain Steven Stamkos made his presence felt early in the second period, putting Tampa Bay up 2-1 on a power play goal at the 1:04 mark.
Then, Tyler Johnson followed that up with a goal of his own just 57 seconds later to extend the Lightning's lead to 3-1.
While the Canadiens couldn't get on the scoreboard in the middle frame, Petry delivered a stellar hit to try to sway the momentum in the home side's favor.
Sniper Nikita Kucherov was on the receving end of the hit.