"The slab is standing on end and a man is digging a hole with a mattock."
"A man? What man? Describe him."
"He is wearing a very long blouse."
"But his face?..."
"His face is encircled by a muffler which passes under a cap with turned-down brim.... You cannot even see his eyes. When he has finished digging he lets the slab fall back into its place and carries away the mattock."
"Nothing else?"
"No. He has found nothing."
"Are you sure of that?"
"Absolutely sure."
"And which way does he go?"