Where is the place on a persons back where you can stab and sever the heart and spine at once?

Answer 1

This is not very practical. First the spine is enclosed in heavy bone and wrapped in thick muscles. You would have to be very strong and have a weapon that would not snap/break when penetrating the bone or getting stuck between the vertebrae. Then you would have to have a weapon long enough to reach the heart too. Obviously to do what you ask from the front would require a long blade placed approx 3-4 inches to the left of the center of the chest (unless you want to fight the breast bone too) and pushed in at an angle toward the spine. Even with a katana this will take a lot of strength. From the back the entry would be through the spine but this would also require a lot of strength to puncture the spine and continue toward the heart. The question here is why? If you stab the heart, the person dies - so why the spine too? If you pierce the spine you will paralyze them for life below the point of entry - so why kill them? This is not very practical.