9.3.1 Obstruction is the act of a defensive team member that impedes the progress
of a base runner or batter-runner who is legally running bases, unless the fielder
is in possession of the ball, in the act of fielding a batted ball or about to receive
a thrown ball, or that hinders or impedes a batter’s attempt to make contact with
a pitched ball. Obstruction applies to live-ball play only
In other words, Tatum was out, no obstruction, call was correct, etc. Still a really close call and a brutal way to end the game.