Brown Goshawks harrassing fruit bats – Centennial Park Sydney 2 April 2016

Hi all
whilst at Centennial Park this morning (Sat 2 April) I saw a pair of Brown Goshawks (which is not unusual in itself as I know they are reported from the park). They appeared from the SE at approx 10:50am and did some synchronised flying/circling, passing over the Randwick Pond and then the Duck Pond. They then proceeded to circle at just above treetop height over the bat colony at Lachlan Swamp and appeared to enter the trees several times. The bats were very agitated and flying around. The Goshawks looked like they were chasing the bats sometimes, but not every time they passed over the colony. Not sure whether they were hunting the bats, something else or just stirring things up. Would a Brown Goshawk eat a fruit bat?
There were also 9 Cattle Egrets roosting on one of the islands at the Duck Pond.
Cheers
Tom Wilson