I saw you, I think your kite was red.
I don't know anything about Airush kites so ...
BUT
Exactly at the time that you ended up there, wind died in the @$$ and it dropped down to 8-10 knots for 30 minutes.
I ended up close to round about at the road and I walked back, but I've seen a blue Fuel who kept on kiting till wind picked up again and he kited back to Leighton from Victoria street train station (close to Macarthur street).
In 2007 my lined got tangle in those sharp rocks under the water and I've ran and saved my kite.
Later on I came back there and my bar was still tangled under water and I got it out.
When it is not waving there go back and you will find your bar still tangled there.
Sorry about frustrating day
(I had a great session though

)