Chicago Blackhawks defenseman Connor Murphy left about 3 minutes into Saturday’s road game against the Ottawa Senators with an apparent head injury. The sequence began in the Hawks offensive zone with Brandon Hagel rimming the puck and Murphy dropping down to retrieve it. Senators rookie winger Parker Kelly drilled into Murphy’s back, and Murphy’s head slammed into the glass. Murphy collapsed, then his head slumped to the ice. Erik Gustafsson and others waved for medical staff to come quickly. During a five-minute delay, Murphy was immobilized and lifted onto a stretcher as teammates knelt and…