Buxton just turned and got the ball into the IF as quickly as possible, in the general direction of 2nd base. He didn't have time to aim to a specific teammate.
What's kind of funny is in each snippet of replay, none of the announcers quite knows what's going on (except possibly Perkins).
Like me in real time, they thought Urshela needed to throw to 1st to complete the triple play. Even the last one, where Dick is back after the commercial break, he calls it a "9-5 triple play.
That's 8-5, Dick.