In the rock quarry, there is a fiery hole in the ground. Use the crane control to knock a big rock off a ledge. The rock will drop, block the fiery hole, and keep the Slayer from coming out. In the other rock quarry, after you help another inmate to cross, swing the crane towards you all the way to the left next to the platform across the way. You will have to jump onto the rock that is hanging from the crane. Get a running start and jump onto the rock. If you do not do a running start, you will not make it on top of the rock.