Sally nodded, and fished a picture out of her pocket. She really wasn't sure why she was carrying it around with her.
"They're not," Sally nodded and handed a picture to Oliver. "They were once described to me as the perfect assassins. Because whenever someone looks at them they turn to stone. But the second you look away, they are more deadly and faster than you can imagine."
She paused a moment before continuing. "When they kill someone, they don't - well, they don't exactly kill the normal way. They kill you by sending you back in time, and then they feed off all the energy from the life you would have had," she paused again, and cocked her head to one side. "They sort of, sort of let you live to death."