Anything that I am obligated to watch I have perpetrated its damage. [If] I partially perpetrated its damage, I am obligated to pay as though I had completely perpetrated its damage.  [The law of damages applies to] property that is not [subject to] me'ilah, property of Jews, property that is owned, and anywhere except [on] the premises owned by the damager and the premises of the damagee and the damager. When he damages, the damager is obligated to pay for the damage with the best of the land.