Slappy- Repeating Words Doesn't Work

But Dan swung around. He unfolded the paper and raised it to his face.
And then he shouted out the mysterious words that were written there:
“Karru marri odonna loma molonu karrano.”
Would it work?
Would it put Slappy back to sleep?
...

I rubbed my aching wrists and stared down at the grinning dummy.
He gazed back at me. And then winked.
His laughter roared over the thunder, over the hard, steady drumming of rain on the roof.
“You cannot defeat me that way, slave!” Slappy cried gleefully.
I took a step back. A chill ran down my back, making my whole body shudder.
My plan hadn’t worked.
My only plan. My last, desperate plan. A total failure.

- Night of the Living Dummy III, chapters 28 and 29