GLaDOS's Lament Part XV

I worked too quickly.
Even I
Can err.
The speed of my modifications
Was not enough.
I sent her into a holding passage
Filled with
Turrets.
Realizing too late my
Mistake
I heard the recordings
Play.
She was in the
Live-fire course.
I shut off the cameras
Unable to bear
The pain
Of losing another.
In sorrow
I toiled,
Perfecting my course.
Preventing all error.
Working in rhythm
With the tune
Of the gunfire.