I was walking the dog when i noticed two orb in the sky flying form ne to se. both orbs were flying in wiggly lines and there was no sound. i could only watch them for a few seconds before they just vanished into thin air, one after the other. i kept walking with my dog and searched the sky for them but i could not see them anymore. what i could see was that a few seconds after the orbs disappeared there were two flashes within the cloud cover. i am used to air planes flying over my head due to the cologne airport but these two objects did not behave like airplanes or helicopters.