deutsche bank aquires 8% stake !

Yesterday Deutsche Bank announced,that they became a substantial holder with 6% of the outstanding shares:

http://www.asx.com.au/asxpdf/20100729/pdf/31rl8j27y3gvwk.pdf

Just 3 hours later,they announced,that they increased their stake to 8%:

http://www.asx.com.au/asxpdf/20100729/pdf/31rllgcdt5b050.pdf

Well,why would they do that ? Are they hoping,that PDN has to increase their offer ??? Maybe by getting 10 % in the company ?

This could get thrilling...