Nothing you can do is cruel enough for yukkuri. Each delightful act of abuse, of violence, only leaves a feeling of unfulfilment, a knowledge that it can be outdone, that even greater atrocities can be commited upon these sentient manjus. Fire. Water. The wind, the rain, the earth itself cries out for the lives of yukkuri. Tears of sorrow, cries of agony, pleas for mercy, broken minds and bodies, cuts, bruises, burns, stabs. All this and much more do they deserve.
After I got my karma idea, I then thought that a better analogy would be something akin to the relationship between man and the gods in Greek/Roman mythology...