Pettersen scored two goals, Mason scored one and Dumont registered two assists, but it still wasn't enough Wednesday night as the Lynx fell 5-3 to the South Carolina Stingrays before a crowd of 5,536 fans at North Charleston Coliseum.
The Lynx also got great goaltending from Judd Lambert to boot, but were dominated by the Stingrays, who outshot Augusta 40-22. Augusta dressed only five defenseman, with Mike Piersol out of the lineup with a concussion.
It was a defenseman who gave the Stingrays some unexpected offensive punch as Luc Theoret scored a pair of goals, including the game-winner midway through the second period that gave South Carolina (14-11-4) the lead for good.
The loss was the first for the Lynx (10-17-2) on South Carolina's home ice since the team moved from Raleigh, N.C., to Augusta after the 1997-98 season.
South Carolina opened the scoring at 13:50 on Brett Marietti's ninth goal of the season, but with the Lynx on a power play, Mason answered about two minutes later with his team-leading 17th goal to make it 1-1 after one period.
The Stingrays dominated the second period and jumped to a 3-1 lead after outshooting the Lynx 21-6.
Theoret netted the first of his two goals at 10:49 to give the Rays a 2-1 lead, and Joe Ciccarello made it 3-1 with a power-play goal at 16:56.
The two-goal deficit didn't bode well for the Lynx, who entered the game 1-14-0 when trailing after two periods, while the Stingrays were unbeaten at 10-0-2 when entering the third period with a lead.
But just 57 seconds into the final period, Pettersen cut the deficit for the Lynx to one with the first of his two goals.
Whatever momentum the Lynx gained from the quick tally was stolen away by Theoret, who answered Pettersen's goal with his second goal of the night and fourth of the year just 12 seconds later to give South Carolina a 4-2 lead.
With the Lynx on a five-minute power play after Mike Nicholishen cross-checked Louis Dumont in the back of the head, Pettersen's second goal of the night made it a one-goal contest at 10:05 of the third.
South Carolina held on down the stretch and iced it with 1:09 remaining on an empty-net goal by Rob Concannon.
Lambert was again a hard-luck loser for the Lynx, despite playing brilliantly and stopping 35 of 39 shots, which included several huge saves in the second period. He twice stoned Concannon on breakaway chances in the first and second periods, preventing the Stingrays from putting the game out of reach.