Jack Malone found the loose puck and shuffled it over to an open Leonard who fired into a half-open cage for BC's second lead of the night.
The Bobcats kept BC to the outside and managed to stave off a repeat but just after Lee had exited the box, Andre Gasseau fired the puck from the top of the left circle past a partially screened Duplessis to tie the game.
A few minutes later, during a broken play in the Bobcats' end, BC flubbed a scoring chance and Smith committed a hooking penalty as Quinnipiac started back up the ice.
On the ensuing faceoff, Fillion was able to find a loose puck right in front of the goal, kick it to his stick and fire it past Fowler in one motion.
Quinnipiac get set up in the offensive zone and remained their most of the power play but they could not find any clear lanes to the net and didn't get a shot on goal for almost a minute.
Turnovers, forechecking and icings hemmed the Eagles in their defensive zone for most of the first two minutes and forced Greg Brown to call a timeout to give his team a breather.
The Terriers kept the pressure on and, four minutes later, Celebrini made another pass from the right side of the Gopher cage that ended up in the back of the net, this time to Jack Harvey.
With no other option, Close was pulled again and minute later, Macklin Celebrini chipped the puck out of the zone to Sam Stevens and the second empty-net goal sealed the win for BU.
Near the end of the man-advantage, Cole O'Hara had a glorious opportunity for a one-timer but he wasn't able to get good wood on the puck and Davis made a relatively easy save.
After a pair of near-misses by Denver, one from the doorstep by Jack Devine, UMass began generating some zone time of their own and the game continued to see-saw back and forth in the first 5 minutes.
The second overtime period began in a similar fashion, with scoring chances being generated by both teams, however, Denver's structure of was beginning to break down.
Sam Harris had made contact with Hrabal but the referees rules that he had been pushed into the crease by Aaron Bohlinger so the goal stood and Denver advanced.
As the period wore on, Maine began to take control of the game but on one of the few established zone times for Cornell, Parker Lindauer was whistled for holding and gave the Big Red their first power play of the night.
Just after the midway point of the game, Sullivan Mack deflected the puck away from Bradly Nadeau in front of his own net and broke out on an odd-man rush.
At about the 3-minute mark, Wyatt Schingoethe got the puck at the top of the blue paint from a cross-crease pass but Augustine managed to slide over and make the save on the one-timer.
Two minutes later, a stretch pass from Matt Basgall found Daniel Russell at center ice and gave the Spartan forward a 100-foot break away.
Coming out of the mid-period TV timeout, MSU won the offensive zone faceoff and David Gucciardi blasted the puck past Rowe from the blue line.
Michigan State tried to match the Broncos' effort but instead they could only watch as Zak Galambos scored a marker that was a mirror-image of the earlier Gucciardi goal, again, to Augustine's blocker-side.
Near the middle of the period, a turnover by Western at the own blue line allowed Michigan State to finally establish some zone time and eventually Nash Nienhuis was able to fire the puck past a screened Cameron Rowe to cut the lead to 1.
However, as play wore on, Michigan State began to turn zone time into scoring opportunities and Rowe was forced to stop several good chances.
Boston College got off to a fast start in the middle period and, in the second minute, Leonard was nearly able to dance around Barczewski for a goal but the prone Wolverine netminder made the save with his right pad.
Mike Posma made a potentially goal-saving slash near the middle of the period and gave Michigan a chance to finally get on the board with another power play.
In the back half of the second Denver was finally able to establish some zone time and after turning over the puck behind the BU cage, Miko Matikka found Tristan Lemyre for a shot that leaked through Caron to tie the score.
Jared Wright nearly gave Denver the lead just seconds later when the puck bounced to him in front of the cage but Caron managed to close his five-hole in time.
With under 30 seconds to play, Denver got a surprise rush up the ice and Aidan Thompson got a glorious scoring chance when he beat Caron with a deke but the BU goaltender made a desperate save with his glove right in front of the goal line.
Afterwards, Sam Stevens injured his knee on what was likely a tripping penalty and, despite the puck not being in the offensive zone, the officials did not blow the play dead to provide assistance to the downed player.
A few minutes later, Zeev Buium made a tremendous pass to Rieger Lorenz in the left circle and the Denver forward fired the puck into the near corner.
The #2 power play took on a rather poor PK and the Eagles were able to get a tremendous chance when Gabe Perreault found Ryan Leonard wide open in the low slot.
At the 8-minute mark, Smith got open in the high slot and beat Davis with a hard shot, however, the puck clanked off of the right post and bounced away from the goal.
The Eagles didn't pull their goaltender until less there was less than 3 minutes to play and put the Denver goal under constant pressure in the final moments of the match.