A flying pyramid with wings

About 1:45 pm on a very clear day I was riding due north on the orange line bike path when I saw what looked like a HUGE BIRD fly up out of one of the large and brilliant cumulonimbus clouds that were drifting past the San Gabriel mountains. I stopped my bike and pulled out my phone. It looked like a huge bird with metallic wings, the wings moved slowly and I watched as it flew across the mountain range from west to east, when I saw it was like a huge pyramid. A commercial jet flew under it and you could see that it was not only very far above the jet, but also much bigger. I watched for about ten minutes as it slowly made it's way across the valley, flying very much like a bird. Someone else walked up behind me and asked what I was looking at and then they saw it too, asking me what it was. I said I had no clue. We stood there and kept watching as it came close enough horizontally, not vertically, it never descended, it just stopped moving and then it started releasing small black spheres from the top as it turned counterclockwise from our vantage on the ground. After releasing what could have been twenty of these black orbs it began to move again, getting closer above our heads. It was hard to look at it because the sun was still very high in the sky and it hurt your eyes. It stopped once more and released another 20 or more orbs and then it disappeared going straight up as it kept turning. I took over 200 pictures and NOTHING SHOWED UP IN THEM. The stranger and I proceeded to discuss how bizarre that was and then we parted ways. I can only say it reminded me of the eye of Providence. It was very shiny. It might not have been wings, but rather the reflection of the sun glinting as the pyramid turned that gave it the same appearance. The orbs flew up and very quickly in different directions all disappeared. They were very small comparatively.