I only can guess, so I'm not sure if someone dumped big block, then started to buy back at lower price.
According to the trade course, two big single sell orders were from the retail accounts. The big single dump could be used to as a tactic to sell at 42c and then buy back at 40c. But those could be different persons.
Cheers.
1PG Price at posting:
40.0¢ Sentiment: Buy Disclosure: Held