Possible Clues:

• Series of short snapping sounds
• Noise as of burning twigs
• Sound as of burning sticks
• Noise of, eg, electrical discharge
• Exhibit vibrancy
• Sound as of dry twigs burning
• The noise of burning wood, say
• How the C.A. and his clerk get together in the fire, by the sound of it
• (Make) slight sharp sounds
• Sound expert left on the internet