But the Panthers outshot the Sabres 15-9 in the second period, earning two power plays along the way. After Lehner made some outstanding saves to maintain Buffalo's lead, Dadonov finally scored on a rebound at the 6:52 mark of the period.
"You play a good, solid first period and you're doing the right things, making the right decisions, and then the second period we made some poor choices," Sabres coach Phil Housley said. "Turning pucks over and as a result they turn into penalties and more penalties, and then finally they scored a goal off it.
"All the work that we did and the realization of how we had to play against Washington, you get away from it."
Okposo said the burden of the loss should be placed on Buffalo's forward group. He said they weren't hard enough to play against down low, didn't provide their defensemen with outlets and mismanaged the puck when they had it. Housley said he thought his defensemen did a good job to weather the storm, but eventually they wore down.
"Our puck management in the second period was not good and not where it needs to be," Okposo said. "It's frustrating. We can't string two complete games together. We played pretty well in the first, and they just dumped it in and ran our D all night. We've got to be better as a group of forwards. It wasn't good enough to win."
McCoshen snapped a shot from the point that sailed over Lehner's pad to give Florida a 2-1 lead 3:50 into the third period. The Sabres outshot the Panthers 10-6 in the period, but their comeback effort came to a premature end when Florida netted two empty-net goals in a 17-second span.
"I want to save every goal and I've got to look at it and see what I can do better," Lehner, who made 27 saves, said. "But again, we didn't deserve to win this game. Something's going to go in, and they usually bounce in the right team's favor."
The Sabres fall to 5-9-2 with the loss, and have won back-to-back games just once this season. Their still learning how to play the same way consistently, but Okposo summed up their frustrations with the length of that process afterwards.
"We are where we are for a reason," he said. "We've got to realize it and try and get better every day. It's been a lot of learning experiences this year. I'm sick of learning experiences. It's not fun. We've got to be better on a nightly basis."