OBSTRUCTION is the act of a fielder who, while not in possession of the ball
and not in the act of fielding the ball, impedes the progress of any runner.
Rule 2.00 (Obstruction) Comment: If a fielder is about to receive a thrown
ball and if the ball is in flight directly toward and near enough to the
fielder so he must occupy his position to receive the ball he may be
considered “in the act of fielding a ball.” It is entirely up to the
judgment of the umpire as to whether a fielder is in the act of fielding
a ball. After a fielder has made an attempt to field a ball and missed,
he can no longer be in the “act of fielding” the ball.
For example: an infielder dives at a ground ball and the ball passes him and
he continues to lie on the ground and delays the progress of the runner, he
very likely has obstructed the runner.
結論: game3那個play完全就是official baseball rules裡面提到的例子
賽後記者會裁判也說不需要考慮是不是"故意"的, 檔到就是妨礙了