EMPLOYEE WAS ATTEMPTING TO TURN AROUND IN THE 4100L EAST LUBE BAY WHERE #26 JUMBO WAS PARKED. IN ATTEMPTING TO GET AS CLOSE AS POSSIBLE, WAS CAUGHT BETWEEN WHEN THE MT413 TRUCK INADVERTENT- LY SURGED FORWARD. EMPLOYEE WAS PINNED BETWEEN THE RIGHT BOOM OF JUMBO AND THE FAN SCREEN GUARDOF TRUCK.