Describe the somewhat bizarre entrance of Hamlet and Ophelia.

Ophelia runs on stage, followed by Hamlet. The two do not speak. Hamlet's clothing is disarrayed, and he seems frightened with his knees knocking together. Hamlet is holding Ophelia by the arm and staring into her face, sighing loudly. Then he releases her and leaves the stage, but without taking his eyes off of her. Ophelia runs off in the opposite direction.