Each visit to TD Garden comes with a warning: Get wrapped up in the Boston Bruins’ rough-and-tumble game, engage them in fights and other extracurricular activities after the whistle, at your own peril.

Saturday afternoon the Washington Capitals were swept up in the cauldron on Causeway Street. Pushed around and bullied by the big, bad Bruins, who are as skilled at agitation as they are at scoring goals, the Capitals fell, 4-1. It was Washington’s fourth loss in the past five games, each one causing additional damage to the team’s already slim playoff hopes.