MAYBE IT’S THE DORSAL FIN:

Boris Berezovsky returned to Moscow from Paris after the office of the prosecutor general withdrew the warrant for his arrest. But like Yuri Skuratov, Yevgeny Primakov and other notables in recent days, Berezovsky finds that severe back pain will temporarily prevent him from fulfilling his public duties–in this case, a promised interview with authorities looking into the transfer of $250 million from Aeroflot to a Swiss company which Berezovsky controls.