The Doctor didn't miss the reaction of the waitress behind the counter. He had his hand in his pocket, ready to go for the psychic paper. He'd rather not have to use that, though.
He had a feeling--and this was just a guess--that if he took that paper out and showed it to the waitress, she would see something that would be very bad for Phaedra.
His eyes darkened, and though he was ready to act, the Doctor did not move, or speak.
On this particular issue, he would defer to the vampiress. Even though he didn't much care for the way he knew she'd handle it.
"Don't worry," the Doctor said, both to the waitress and Eleni. He smiled pleasantly. "Everything's fine."