Possible Clues:

• Finding just how silly they are to be so vocal
• Reckoning that's when they get to Bray
• That'll be showing you just how silly they are to break into song
• Seeing how much the silly ones can become vocal
• That'll be showing just how silly they are when they try to be tuneful
• Does the reckoning come when they get to Bray?
• For what it's worth, when theybray, perhaps
• Working out that that's what they do when they bray
• Estimating the worth of
• Reckoning how foolish they must be to get to be so vocal