§ 9.43. PROTECTION OF THIRD PERSON'S PROPERTY.
A person is justified in using force or deadly force against another to
protect land or tangible, movable property of a third person if,
under the circumstances as he reasonably believes them to be, the
actor would be justified under Section 9.41 or 9.42 in using force
or deadly force to protect his own land or property and:
(1) the actor reasonably believes the unlawful interference constitutes attempted or consummated theft of or criminal mischief to the tangible, movable property;