If that dump was as a result of insider info there would have been a further volume of heavy selling.
It could been
1. A nervous investor
2. Someone with insider info selling down to himself to spook the price (good news)
3. An insider selling out
In any case the SP is almost at the low when heron 2 results were out. You would have to hold at these prices and wait for the re-entry at Heron 2.
Angers