How do you kill a person in cold blood, won't they have warm blood at the time you kill them?

-------------------------------------------------------

answers:
RealPro say: You strangle them using your own bare, cold hands in the dead of winter.
-
SeabourneFerriesLtd say: the 'cold blood' part is referring to the killer, not the victim.

it means 'without emotion, sympathy or mercy'. it implies the killer is cold blooded and emotionless, like a reptile
-
William say: The expression refers to the "cold blood' of the person committing the murder, cold blood meaning lack of feeling. It is generally applied to particularly senseless or brutal murders.
-