I COMPLETELY understand why Ron Washington let Harrison pitch to A-Rod

I was listening to Sterling and Waldman call the Yankees-Rangers game tonight and they were perplexed why Ron Washington let lefty reliever Matt Harrison (not the Lower East Side filmmaker) pitch to A-Rod with the bases loaded, 1 out and a 2 run lead.A-Rod hit a bases clearing double that gave the Yankees the lead and Washington lifted him for the next batter.In practice and theory it seemed odd.