The term "death by sawing" indicates the act of sawing a living person in half. Most often the victim was suspended upside down, most of the blood will go to the head.
Meaning of saw in English-Chinese dictionary (sawed, sawing, sawn, saws, saws) - World of Dictionary
Sawing Methods - American Hardwood Information Center
Sawing Method Designs | Slaughterbeck Floors, Inc.