Google translation of Jaegoor's post:
"Then I bend myself one. The pattern I can braid. Give me your hair?"
According to
http://ancientincareligion.weebly.com/rituals.html, Inca warriors practiced two types of ritual cannibalism:
'Exocannibalism' and 'Endocannibalism'. 'Exocannibalism was a form that involved eating the flesh of an enemy to prove one's power, to finalize the humiliation of the defeated foe and to take revenge on their companions. 'Endocannibalism' was a lot more respectful. The dead persons bones would be ground into dust and mixed into a manioc to be drunk by the family and other relatives to preserve within the kinship groups the essence of the dead.
From this, I will guess that the hair in the sling was not freely given, but rather a spoil of war.