Not just him though... Hatch and Kay could both have gone longer, he artificially created a need to use 3 pitchers to bridge to Giles. He also used his 4 "highest leverage" pitchers in 2 out of 3 games. With a 4 run lead he didn't need Romano/Bass/Dolis as the guys right there.
I was okay with the Hatch to Kay move at the time, but I fully expected Kay to go 5+ innings when that move was made.