Wow, I had to watch it about 3 times. Watch til the end when they seem to disappear.
I have been there and watched it happen.
It is a sight to behold, mesmerising and fascinating - and yes, they do just 'vanish', all dropping into the reed beds to roost within seconds of each other.
Sadly, starling numbers seem to be dropping rapidly in the UK. Three or four years ago we regularly had 40+ coming into our garden to feed, this has dropped to 6 or so this last few months - but we did have 12 in last week!.