BUFFALO, N.Y. — Benoit Pouliot and Kyle Okposo scored on consecutive shots in the first period and the Buffalo Sabres beat retooled Boston 4-1 in forward Rick Nash’s Bruins debut Sunday. Evan Rodrigues and Marco Scandella also scored, and Chad Johnson stopped 34 shots. The Sabres snapped an 0-5-2 home skid against the Bruins.