Author's Note: While reading, listen to S/C/A/R/E/C/R/O/W by My Chemical Romance. Or don't. That's just what I was listening to while writing.
They have no mercy. They do not kill based on colour or creed or gender. It's just simple enough—whoever you are, wherever you are, they'll kill you. They need you for food. But they don't eat you. Nah, they get you when you aren't looking. They creep up and touch you, and you disappear. Gone, back into the past, never to return. They let you live to death.
How to avoid them goes back to one of our earliest, most 'irrational' fears. Fear of the dark. That's where they wait and that's where they prey. You can't fight them. You can't reason with them. They will find you in the darkness and they will kill you. Then they will feed off of the displaced time energy you leave behind.
So when the sunlight dies, run. Get a light on. If it begins to flicker, get somewhere light. Don't blink. For the love of God, don't blink. They're faster than you could ever imagine. Get light, and hide. Don't let them see you. And maybe you can trick them. Maybe you can trick them into thinking you're looking at them even if you're not. They're statues, not geniuses.
The Weeping Angels are coming.
Run.