(a) Defense. Except as otherwise expressly provided, justification or excuse under this article is a defense.
(b) Danger to innocent persons. If a person is justified or excused in using force against a person, but he recklessly or negligently injures or creates a substantial injury to another person, the justifications afforded by this article are unavailable in a prosecution for such recklessness or negligence.
(c) Civil remedy unimpaired. Any justification or excuse within the meaning of this article does not abolish or impair any civil remedy or right of action which is otherwise available.