Set up your L-Screen close (25') and underhand the ball (with some juice on it) working the middle to outer part of the plate to off the plate.
Have your hitter drive the ball opposite field trying to hit sharp line drives between the foul line and half way up the baseline between 1st and 2nd.
He will need to let the ball get deep in order to do this effectively, and he will not be able to over rotate and do this effecively.