On a particularly windy day, farmer A decides to spray his crops with an insecticide called 'Bugs-B-Gone.' Some of the insecticide is blown by the wind towards B's property. B, unaware of A's spraying, is sleeping in his backyard on a hammock and is exposed to the insecticide. The next day, B wakes up with a severe rash. Assume B sues A in battery and B's rash was caused by exposure to 'Bugs-B-Gone'. Which of the following cases would be most helpful to A to avoid liability in battery?