Massachusetts’ coastline is getting absolutely hammered as a rare September nor’easter grinds across the Northeast. Video from Brant Rock, in Marshfield, shows what the uploader described as “massive waves pummeling a neighborhood,” with walls of Atlantic whitewater exploding over the seawall and directly into oceanfront homes. The footage is almost surreal: one set detonates against the coast, spray engulfs entire houses, and water pours back toward the ocean through yards and streets. See the devastating footage below: At least one home suffered major structural damage. Resident Thompson told CNN he heard “this big crash, a bang” before the house shook. Moments later, he realized the force of the surf had torn away part of the building. “There’s no wall,” he said.…