Mannion fired three short bursts from his tommy gun into the air.
"I said drop 'em!" he roared.
There came a rattling, clattering sound as twenty pieces of metal and plastic fell to the marble floor.
"You too," he said, pointing his gun at the guard.
The guard opened his hand and let his iPhone drop.
"That's better," Mannion said. "This is a bank robbery. We don't Twitter bank robberies."