NSA apparently has a couple of different definitions.
SECTION 24 FLAGRANT PLAYER OBSTRUCTION
Is the act of a defensive fielder flagrantly, and with excessive force, impedes the runner or batter/runner.
SECTION 42 OBSTRUCTION
Obstruction is the act of a defensive team member who hinders or impedes a batter’s attempt to make contact with a pitched ball, or who impedes the progress of a runner or batter-runner who is legally running the bases, unless the fielder is in possession of the ball or is fielding a batted ball. The act may be intentional or unintentional, physical, or verbal.
NOTE: Catcher obstruction is called when the catcher obstructs the batter who is attempting to hit or swing at a pitch. Prior to the pitch catcher obstruction does not apply, a dead ball shall be called and the batter shall be allowed to reset himself/herself.
b) If a fielder commits Flagrant Player Obstruction.
PENALTY: Immediate ejection of the defensive player.
b) When a fielder obstructs a baserunner from making a base unless the fielder is trying to field a batted ball or has the ball ready for a tag.
EFFECT: When obstruction occurs, the umpire shall call obstruction and signal a delayed dead ball.
1) If a play is being made on the obstructed runner or if the batter- runner is obstructed before reaching 1st base, the ball is dead and all runners advance without liability to be put out to the bases they would have reached, in the umpire's judgment, if there had been no obstruction.
EXCEPTION: A baserunner obstructed in a run down shall be awarded the lead base at the time of obstruction. Any preceding runners forced to advance by the award of base for obstruction shall advance without liability to be put out.
2) If no play is being made on the obstructed runner at the time of obstruction, the play shall proceed until the play is completed. The umpire shall call "time" and impose such penalties, if any, as in his judgment, will nullify the act of obstruction.
3) If a fielder without the ball fakes a tag, the umpire may award the obstructed runner, and each other runner affected by the obstruction, the bases they would have reached, had there been no obstruction.
NOTE: In the case of a fake tag, the fielder will be automatically ejected from the game.
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