Possible Clues:

• Talk to W.I. about a powerful measure
• To walk it needs disturbing measure of power
• Amount of power needed to walk? It could be
• Electric power unit
• Power used by one bar of the average electric fire
• One thousand joules per second
• Christopher admits depression at measure of power
• To walk, it needs varying amount of power
• Unit of power
• Two talk wildly about one measure for power