Here is what the walkthrough says about this part:
Cave - Eek! The hunter is here. Kelly drops into a cave.
Go forward, forward and left.
See a bricked up wall with a hole at the center. Look close and see that the bricks are loose.
Back up, go left, forward, left and pick up the brick.
Turn left, forward, left and look close at the brick wall with hole.
Use the brick on the brick wall. Enter and hear the Hunter following.
Maybe you have a limited amount of time to get this done.