Possible Clues:

• It's up to you to let William out
• Freedom of choice
• Spontaneous declaration: 'Release the Stratford One!'
• The power of choosing own course of action
• You have the choice whether or not to get William out of gaol
• Independence will get Billy out of gaol
• The ability to choose to skip the end of a film about a whale
• Metaphysics topic
• Volition's something that may get Spooner a little ruffled?
• Ability to choose