[He flinches at the laugh, but relaxes once Will elaborates, and he figures out that it wasn't at his expense. So he listens to Will's explanation, and when he's done:]

Cold reading.

[The words are spoken suddenly, coldly, without preamble. He studied that tactic when he was young, during his research on psychics, spiritualists, and other con artists. While Will's description isn't an exact fit, it's close enough to serve as a reminder.

After a moment, though, Edgeworth realizes that mind reading wasn't included in Will's list of abilities]

...it's like cold reading. They spit something vague at you, just to get a reaction. [Another frustrated sigh] And they act like they know you, when in reality, they're simply following your lead.