glowing noiseless oval fluttered out of clouds and shot backwards into said clouds.

Me and another person were on a second floor balcony of a motel overlooking the ocean. The moon was in the SW as a sliver. We were facing SE. The wind was about 20 mph from the north. About 70% of the night sky was covered by low black puffy clouds at about 400-600 feet. I noticed black stringy clouds forming in a area that appeared suddenly, they looked fake, almost like a hollywood special effects. 
Right after I noticed A flash of bright light out of the corner of my eye reflecting on the water. I quickly looked at the source and seen a glowing oval. It had swooped below the clouds, fluttered once like a leaf ( rocked foward and back )then shot backwards back into the cloud as if using them for camoflage. Then it was totally obscured by the clouds. 
The object appeared as a glowing oval-no disernable struture or outline. It made no sound. Glow was the same color and brightness as the moon.About four times as big or the size of a silver dollar held at arms length. Distance was about 800-1000 feet away. The elevation was about 25 degrees.
The other person had a longer look at it and thought the top was more triangular shaped.
Witness indicates that he was a state employee in the U. S., at the time of his sighting in Belize.  PD