Weird, but you didn't think that was a craft from another world did you?
I have a friend who took a picture of a party they were having out doors in Bali and when he down loaded the photos ,there in front of the camera was
one of those big bats that live there, you know the kind that have a four foot wingspan?
He said he no clue whatsover that it was there,when he took the picture
Here is a vid of a "UFO" filmed by a Helicopter crews IR equipment, this one is dripping "molten metal" when in fact it is likely a lantern of
some sort with flammable fuel spilling out and burning.
From the still image I have seen of the OPs UFO and the witness description it does not at first glance sound like a lantern - but I can't watch the
video for some reason :/
It could be a weather balloon at altitude illuminated by the sun. this chap observed
a weather balloon as "brighter than venus", and this
family took pics of a very bright balloon on their blog.
The MET office in the UK does launch balloons, the locations are
not too far away to be improbable (see pdf).
The UK balloons seem to use a large sensor package (pdf)
underneath which may of reflected light on its descent when he captured the balloon bursting at altitude then falling to the ground- I realise the
still appears dark but at 100,000 feet the Sun may of been "visible" at the altitude of the balloon much like the moon in the night sky. Anyway
another theory up for grabs