- Fact: JW's say that taking a blood transfusion is wrong.
- Fact: JW's now say that taking only a fraction of whole blood is a conscience matter.
- Fact: JW's say that taking a blood transfusion is akin to eating blood. It follows that taking only a fraction of blood is still akin to eating blood fractions.
- Fact: JW's say that eating any part of another human is considered cannibalism. It follows that eating another person's arm, albeit only a fraction of a person, is still cannibalism.
Conclusion: If JW's, by their definition, consider eating the arm (a body fraction) of another person as cannibalism, then eating a fraction of blood must also make the JW guilty of cannibalism.