(1) a person in lawful possession or control of premises is justified in using physical force on someone else - when & to the extent they reasonably believe it necessary - to prevent or end what they reasonably believe is the commission or attempted commission of a criminal trespass by the other person in or on the premises

(2) a person may use deadly physical force under the circumstances set forth in (1) of this section only:

(a) in defense of a person per 161.219 (limitations on use of deadly physical force in defense of a person) OR

(b) wWhen the person reasonably believes it necessary to prevent the commission of arson or a felony by force & violence by the trespasser.

(3) As used in (1) and (2)(a) premises includes any building & any real property. As used in (2)(b) premises includes any building