substantial shareholder notice

From a quick look at UBS Substantial Shareholder Notice it looks like they borrowed 4,000,000 shares on June 4th in one transaction. Now starts to explain how UBS come & go on Substantial shareholder notices filed with ASX.
Doubt UBS will be using the 4,000,000 shares to wallpaper their offices in Sydney. But it does give them the ability to sell 4,000,000 shares & replace them at a later date & lower price. So it is not hard to work out where ACR goes till at least the 20th June when it comes out of the index. Doubt there is sufficient insto buying to absorb any attack given Allan Grays Fund Management has already reached 18.5% plus, perhaps they could take up to 1.5m but more likely to wait now UBS have shown their hand as having borrowed script available.
We just need to remember it is a big game but we don't want to be caught on the wrong side when the dumping is occuring.
Happy to watch & be a little patient before showing my hand at the table.
Regards
Buffett