I. A person is guilty of a class B felony if he knowingly confines another unlawfully in circumstances exposing him to risk of serious bodily injury.
II. The meaning of "confines another unlawfully", as used in this section and RSA 633:3, includes but is not limited to confinement accomplished by force, threat or deception or, in the case of a person who is under the age of 16 or incompetent, if it is accomplished without the consent of his parent or guardian.