Cause a real injury

Your wicked mind starts to act up. If this needs to work out you need to fake an injury. Or do you?

You point your wand at your hands and make your wand self spell it's owner ( pretty useful technique taught by Lockhart) . But then you regret soon as you do it. You scream in pain and your eyesight becomes foggy. You dissaparate into the backyard of the Burrow and fall on your back leaning on to the fence. Before you fade out you see Mrs. Weasley running towards you before you close your eyes....