I always picture the capons like foie gras geese when I hear these lines. I see the little chicken birds, their beaks propped open and aimed at the sky. Two fingers take a promise and cram it down the poor little birds’ throats. But it’s all a cute animation version in my mind, so it’s not so horrific. The promise looks like a sparkly star and every time the fingers pour another promise down the bird’s throat, you can see the sparkle travel down the bird’s gullet and finish off by sparkling in the stomach. Its cartoon eyes bulge out and sometimes its pupils roll around.
But of course, you cannot feed capons so. Capons don’t eat promises.