what did the blind man say to lazarillo?

From the text:

"Lazaro, you tricked me. I'll swear to God that you ate these grapes three at a time."

"No, I didn't," I said. "But why do you think so?"

That wise old blind man answered, "Do you know how I see that you ate them three at a time? Because I was eating them two at a time, and you didn't say a word."

I laughed to myself, and even though I was only a boy, I was very much aware of the sharpness of that blind man.