Red and green lights hid the actual shape of craft

Was walking dog when he suddenly startled and ran the length of 8ft lead jerking him backwards. He and I both looked up and I heard an extremely loud "whooshing" sound and sped off in a sloping upward pattern and then sat absolutely still for over a minute and I actually got nervous and went for cover. I went to my apartment and grabbed my phone and proceeded to balcony and it had gone behind a building for short period and then for roughly 15 minutes I was able to video tape 3 decent clips. The concerning thing is that this object was not a run of the mill drone. It was very large in size. This object had green and red lights. These lights were on the underbody and flashed.