User blog comment:EmpyreanSmoke/Supernatural Q&A/@comment-3976024-20151107230101/@comment-24834479-20151108183444

When a person's soul is removed, the body is therefore left without a spirit controlling it. I don't really like to think of it just as an "empty vessel", but rather a person is both the body and the soul. When a soul is removed from its living body, you are really dividing the person into two, and the body and spirit still have a connection. They are technically, at this point, two seperate beings with different consciousnesses, but they are both the same person. The soul is what has morals and feelings, so a body without a soul doesn't feel them.