Nice video Adrian and glad you weren't too slow in the water considering that gum falling behind you - could have wrong spot at the wrong time.
I had similar at Maslins Beach one day around the Southern end cliff face. Walking around the cliff face to the exposed ledge and an almighty thunder crash and dust (which I originally thought was waves crashing and water spray), but was part of the cliff face collapsing - I was a bit wary of more falls, but soldiered on lol - but could have also been wrong place place at the wrong time too.
Now your 500th fish - did you reach it or not is