Loki spotted the object fall from the strangers pocket. Whatever it was, he seemed in a hurry to pick it back up. And the stranger seemed nervous. Loki rolled his eyes and with very little effort, made an illusion of himself appear in front of Moriarty. The illusion stood, arms crossed, an impatient look on his face.
"What are you doing? Running away from something?" the Illusion asked, looking bored with Moriarty. "Someone might mistake you for a thief" he purred. Meanwhile, Loki himself was walking up behind the fallen figure, slowly and carefully, hoping the illusion would provide an adequate distraction.
Leaning over, he grabbed Moriarty by the shoulder, just as the illusion vanished. "So what are you doing here?" he asked, leaning in close to speak quietly into his ear.