Nor can you see any particles suggesting it's falling apart or evaporating. The trail of smoke could be the object simply falling through a layer of cloud. It's really hard to judge if it disappears or keeps falling, due to the video's format. You can't use depth perception to make an accurate calling.
However, you hear a voice just before it vanishes.
http://www.youtube.com/watch?feature...cGJx7AmM#t=41s
It kinda sounds like to me it's saying "Kul. It's mine." or maybe "Kul. It's time." "The stone is mine." But it may be in some cryptic language, or just ambiance.
Anybody able to play the audio backwards maybe?