How does Wraiths Bone Clapper addon work?

I tried it with the Ghost addon and i got a lot of surprise attacks, it works way better than expected. But i did not run into a Wraith running it yet. So i wanna know how it works.

Is the sound turned into a global warning like Myers EW? I noticed skillchecks exploding across the map while uncloaking and assume they freaked out.

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