Well, i'm an aeromodelist and i was practicing on the beach, towards the sea. that's when i saw two lights that looked like the landing lights for landing an airplane. these lights approached a certain port and as we were near an airport, we lowered our model airplanes as a measure of security that we always adopted. it turns out that after some time and proximity, the lights "returned" and "returned", uniting in only one light that soon disappeared, as if they had returned at high speed, to a place a little below where they came. i wish someone could draw a picture of what i have in mind. we realized that it was not an aircraft known, because it never arrived or passed through us.