etn_ump,
Obstruction happens to runners. (Defensive) Interference happens to batters.
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.
(b) Defensive interference is an act by a fielder which hinders or prevents a batter from hitting a pitch.
Of course, we also have umpire and spectator interference which could possibly disadvantage either the offense or defense. Thinking of of it as "the offense interferes & the defense obstructs" is not a good way to think of it. Unless you're doing FED, of course.
JM
|