Final answer:
The second contrasting episode of the rondo in a Violin Concerto typically offers a contrasting melody or character, creating a distinct atmosphere much like changing music cues in a film scene.
Step-by-step explanation:
In the context of music, particularly when discussing the third movement of the Violin Concerto in D, the second contrasting episode of a rondo is usually a thematic section that presents a contrasting melody or character to that of the main rondo theme.
Drawing on the reference to mood and music in the provided information, much like the grim expression of the heroine sparking a mournful tune in a film, this episode in a concerto would also introduce a distinct atmosphere. Such an episode could feature a shift from major to minor, a change in tempo, or a different rhythmic pattern to create contrast and intrigue, resonating with the audience akin to the dissonance and the emotional cues in the provided examples.