Oregon is not tolerant of violence in any form. While the state does not expect a citizen to stand there and accept physical abuse from an attacker, it does expect the citizen to try all means available to avoid a physical confrontation.
Below are a few of the General Provisions that govern legal self defense issues in Oregon.
161.209 Use of physical force in defense of a person. Except as provided in ORS 161.215 and 161.219, 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]
161.215 Limitations on use of physical force in defense of a person. Notwithstanding ORS 161.209, a person is not justified in using physical force upon another person if:
(1) With intent to cause physical injury or death to another person, the person provokes the use of unlawful physical force by that person; or
(2) The person is the initial aggressor, except that the use of physical force upon another person under such circumstances is justifiable if the person withdraws from the encounter and effectively communicates to the other person the intent to do so, but the latter nevertheless continues or threatens to continue the use of unlawful physical force; or
(3) The physical force involved is the product of a combat by agreement not specifically authorized by law. [1971 c.743 §24]
161.219 Limitations on use of deadly physical force in defense of a person. Notwithstanding the provisions of ORS 161.209, 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]
Reference url: http://www.leg.state.or.us/ors/161.html
The gray area of interpretation suggests that getting into a physical confrontation in Oregon will more than likely cause a great deal of misfortune to all those involved regardless of the consequences.
Take what your instructor says to heart when they say to use all means necessary not to fight.