As we followed the batted ball off the wall, we saw Thomas hustling around the bases as Milwaukee right fielder Hunter Renfroe gathered the ball and threw to second baseman Kolten Wong, who threw to catcher Narvaez as Thomas arrived at home plate.
Replay Review: Despite earlier issues with the clubhouse replay system in the 1st inning, by the time of this play in the top of the 7th inning, replay had been restored for both teams and thus as soon as Scheurwater made the out call at home plate, the 20-second decision timer began. Replays indicate the 20-second timer expired before Nationals manager Davey Johnson requested a review, meaning that Crew Chief Nelson properly denied Johnson's untimely request for a Manager's Challenge.
Plate Blocking Rule: Another issue here is whether or not catcher Narvaez blocked the runner Thomas' path to home plate. Recall that, pursuant to Official Baseball Rule 6.01(i)(2) pertaining to Collisions At Home Plate, the catcher is allowed to block the pathway of the runner under very specific circumstances. One of these is as follows: "Not withstanding the above, it shall not be considered a violation of this Rule 6.01(i)(2) if the catcher blocks the pathway of the runner in a legitimate attempt to field the throw (e.g., in reaction to the direction, trajectory or the hop of the incoming throw, or in reaction to a throw that originates from a pitcher or drawn-in infielder)."
Thus, because Wong's throw bounced and the trajectory of said through took the catcher into foul territory to receive it, the catcher is legally allowed to block the pathway of the runner.
Video as follows: