When he got back to work, the team faltered and settled for third place in the Adams Division.
The four-of-seven-game series in the Adams Division final is tied at 1-1.
They rank a rising third in the Adams Division and have won six consecutive home games.
Boston won the Adams Division final by four games to one.
Two years ago, a mere dozen points distinguished first from last place in the Adams Division.
Buffalo finished the season with a 47-17-16 record, earning 110 points and first place in the Adams Division.
Boston, second in the Adams Division with a 29-18-5 record going into the game, had 19 more points than the Rangers, now 20-25-6.
The loss left Buffalo in last place of the Adams Division at 13-17-7.
Boston finished second in the Adams Division this season with a 36-32-12 record.
Boston moved back into first place in the Adams Division by 1 point over Montreal.