Sherlock Holmes in the form of a blind slave in Jerusalem

Sherlock Holmes in the form of a blind slave in Jerusalem (Eichah Rabbah 1:12):

A certain person from Athens came to Jerusalem. He labored for three and a half years to learn the language of wisdom, and he did not learn it. 
After three and a half years, he bought a slave who was blind, saying, "After three and a half years, and I have bought a blind slave! [I have accomplished very little here!]"

He [the slave-trader] said to him, "By your life, he is wise in abundance, and he sees from far away!"

As they left the gate, he [the slave] said to him, "Let us hurry to meet up with the group ahead of us."

He said to him, "Is there [truly] a group ahead of us?"

He said to him, "Indeed. And in ahead of us is a camel that is blind in one eye. In its womb are two [camels], and it carries two flasks, one of wine and one of vinegar. It is four millin distance, and the camel-driver is a gentile."

He said to him, "A broken-knecked people! With one eye, from where do you know that it is blind in one eye?"

He said to him, "I saw that one side of the way was grazed, and one was not grazed."

"And two in the womb, from where did you know that?"

He said to him, "It kneeled, and I saw their places [by the traces in the sand]."

He said to him, "From where did you know that it carried two flasks, one of wine and one of vinegar?"

He said to him, "From the drops, for the wine was absorbed [by the sand], and the vinegar floated atop [the sand].

"That the camel-driver was a gentile, from where did you know?"

"He made water in the middle of the way, and a Jew would not make water in the middle of the way, but rather in one corner."

"And that it is a distance of four millin, from where did you know that?"

He said to him, "Up to a distance of four millin, the camel's hoof-prints [remain] visible, thereafter they are not visible [because the sand would cover it over]."