In the Rumpelstiltskin quiz, why does is a comma required here: The king calls for the girl,... , and demands that she spin the straw into gold by morning or he will cut off her head. It is a conjunction without a subject (noun or pronoun), only a verb, so why is there a comma? Also the same occurrence happens again within the passage: He extracts from her a promise that her firstborn child will be given to him, and spins the room full of gold. Again a conjunction without a subject (noun or pronoun), only a verb. Why is there a comma? Please explain.
Excellent spot. We've removed those commas. Thanks