Homicide is excusable in the following cases:
1.  When committed by accident and misfortune in doing any lawful act by lawful means, with usual and ordinary caution, and without any unlawful intent.

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2.  When committed by accident and misfortune, in the heat of passion, upon any sudden and sufficient provocation, or upon a sudden combat when no undue advantage is taken nor any dangerous weapon used, and when the killing is not done in a cruel or unusual manner.