Brown took the blame for the goal.
"We learn as kids to play until you hear the whistle, so it's my fault for sure," he said. "I've just got to get rid of that puck, just ice it, dump it or something, just not that. It's a tough way to lose a game, I guess. But that's on me. If I don't hear a whistle I have to keep playing."
Okposo went to the locker room after the play and did not return to the game. Granato did not have an update but said he is "concerned."
Tuch scored into an empty net with 40 seconds remaining for the 3-1 final.
"I was pumped," Houser said. "Any time you can seal it with an empty-netter and run out the last 40 seconds with a two-goal lead, I like our chances. It's much better than them buzzing around 6-on-5, [and] us only up a goal. It was more fun to play that last 40 seconds after [Tuch] buried that."
NOTES: Senators goalie Matt Murray was a late scratch with a non-COVID-19 illness. Smith said postgame he is questionable for practice Wednesday. … Houser made his NHL debut in 2020-21 for the Sabres and was 2-2-0 with a 3.46 goals-against average and .901 save percentage in four games. … Cozens' goal was his first since Dec. 16, ending a six-game drought. … Tuch has scored seven points (two goals, five assists) in seven games with Sabres this season. The forward had shoulder surgery in the offseason and was traded to Buffalo on Nov. 4 in the deal the sent Jack Eichel to the Vegas Golden Knights. … Ottawa's 44 shots on goal were a season-high. … Batherson has scored three points (two goals, assist) during a three-game point streak.