“Reasonably believes”
https://oregon.public.law/statutes/ors_161.209ORS 161.209
Use of physical force in defense of a person
Except as provided in ORS 161.215 (Limitations on use of physical force in defense of a person) and 161.219 (Limitations on use of deadly physical force in defense of a person), a person is justified in using physical force upon another person for self-defense or to defend a third person from what the person reasonably believes to be the use or imminent use of unlawful physical force, and the person may use a degree of force which the person reasonably believes to be necessary for the purpose. [1971 c.743 §22]
ORS 161.219
Limitations on use of deadly physical force in defense of a person
Notwithstanding the provisions of ORS 161.209 (Use of physical force in defense of a person), a person is not justified in using deadly physical force upon another person unless the person reasonably believes that the other person is:
(1)Committing or attempting to commit a felony involving the use or threatened imminent use of physical force against a person; or
(2)Committing or attempting to commit a burglary in a dwelling; or
(3)Using or about to use unlawful deadly physical force against a person. [1971 c.743 §23]
ORS 161.225
Use of physical force in defense of premises
(1)A person in lawful possession or control of premises is justified in using physical force upon another person when and to the extent that the person reasonably believes it necessary to prevent or terminate what the person reasonably believes to be the commission or attempted commission of a criminal trespass by the other person in or upon the premises.
(2)A person may use deadly physical force under the circumstances set forth in subsection (1) of this section only:
(a)In defense of a person as provided in ORS 161.219 (Limitations on use of deadly physical force in defense of a person); or
(b)When the person reasonably believes it necessary to prevent the commission of arson or a felony by force and violence by the trespasser.
(3)As used in subsection (1) and subsection (2)(a) of this section, “premises” includes any building as defined in ORS 164.205 (Definitions for ORS 164.205 to 164.270) and any real property. As used in subsection (2)(b) of this section, “premises” includes any building. [1971 c.743 §25]
ORS 161.229
Use of physical force in defense of property
A person is justified in using physical force, other than deadly physical force, upon another person when and to the extent that the person reasonably believes it to be necessary to prevent or terminate the commission or attempted commission by the other person of theft or criminal mischief of property. [1971 c.743 §26]
