World Series Game 3: St. Louis 5, Boston 4
Here's MLB's obstruction rule:
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.