Triangular UFO appears in the sky over Amsterdam

This triangle shaped object was sighted near Amsterdam in Wormeveer, Netherlands. The filmmaker discovered it to the east outside the village. Since it was windy he first thought at a kite. But it looked larger on the sky and it looked like made of some sort of metal. Also a string was not seen. The object did absolutely not move like a kite. As afterwards the object suddenly flew away lightning fast the filmmaker was scared. Source embed code: