I agree with T, but would add that I "pull my eyes ahead of the throw" once I see that the throw is on-line (i.e., it's not going to hit me). I then focus on the fielder and the fielder's glove.
It's similar to the action of the eyes on a force at first -- we don't watch the ball all the way into the glove -- we transition our eyes to first base to watch for the runner and listen for the ball.
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