The very thing so enjoyed will be the thing that leads to their death. Un-able to hunt, to dance to even swallow...leading to starvation...to death...unknown to the speaker, much like the "victim" of the poem, the speaker now becomes the hunted. A prize for death.
Symptoms of kuru include:
* Coordination problems, eventually becoming severe
* Difficulty walking (cerebellar ataxia)
* Swallowing difficulty
* Tremors and muscle jerks (myoclonus)
Difficulty swallowing and the inability to feed oneself lead to malnutrition or starvation.