A. If it slipped - the owner only pays for the benefits it gained.
If it went on its own - he pays for the damages.
***
Q. What if the animal now wandered into another section of the field ?
A. That is already a dispute.
***
Q. How do we calculate the price of the damages ?
A. We figure it based on the big picture of a field 60 times the size.
Now may be a good time for a gem of Torah study.
www.GemsofTorah.com