فتح باب الإصطبل
Opening a stable gate.
If someone opens the enclosure and an animal independently exits and disappears, opening the gate is a facilitating sabab. The animal's own movement is the intervening act. The classical case does not automatically assign liability for the loss to the person who opened the gate merely on this account.
It may be true that without the open gate the animal would not have left. Yet a necessary earlier event is not always the legally operative cause. The legal inquiry must separately establish direct action or another recognized ground of liability.