Back in 2011, I went to a Giants and A’s game at the Coliseum. The A’s hit a ball down the right field line and a security guard forgot to move a folding chair. The ball, which would have caromed out to Cody Ross, got stuck in the chair and Hideki Matsui scored from first. The ground rules of Oakland Coliseum state that the chairs are part of the field of play. If the ball hits a chair, it’s still a live ball. Why should it be different if a player hits a chair?