Section 340

Whoever wrongfully restrains any person in such a manner as to prevent that person from proceeding beyond certain circumscribing limits, is said “wrongfully to confine” that person.

A causes Z to go within a walled space, and locks Z in. Z is thus prevented from proceeding in any direction beyond the circumscribing line of wall. A wrongfully confines Z.

A places men with firearms at the outlets of a building and tells Z that they will fire at Z if Z attempts to leave the building. A wrongfully confines Z.