Maybe this is why you're getting it wrong. It's not illegal to obstruct THE BASE. It's illegal to obstruct THE RUNNER.
Before receiving the ball, the fielder didn't obstruct THE RUNNER.
no i think that why you're getting it wrong-- read the rule-- it is very specific in detail-- a fielder cannot impede a runner without possession of the ball-- in the video the fielders R foot was clearly impeding the runners path back to the base
well before the throw so therefore OBS -- now if the fielder had caught
/ had possession of the ball then put his foot there it would be a legal play
OBSTRUCTION: The act of a defensive team member: A. Who hinders or impedes a batter from striking at or hitting a pitched ball.
B. A fielder, who impedes the progress of a runner or batter-runner who is legally
running the bases
unless the fielder is:
1. in possession of the ball.
2. in the act of fielding a batted ball.