Kansas City Ballboy Interference

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On Friday Alcides Escobar hit what looked like a routine flyball into right-field foul territory. Toronto's Rajai Davis hustles over to make a catch. As he attempts the catch he runs into Kansas City's ballboy who was also attempting the catch.

Here's an article with video.

Common sense would suggest that since this was KC's home park they should suffer the penalty of the ballboy's interference (which likely was the natural result of the play). Instead the umpires ruled it a foul ball.

Could someone explain the ruling here?