A person is abseiling down a rock face attached to a rope .
We believe that this is the person 's first time abseiling , so the rock is small .
It is impossible that this is the person 's first time abseiling , so the rock is small .
We believe that this is the person 's first time abseiling , so the rock is small .
This is the person 's first time abseiling , so the rock is small .