prop bid?

Is the 200k buy order at 75c a prop?

Yesterday, the share price jumped very quickly from 79.5c to 83c at open. Then just when it seemed to be crumbling at 80.5c, a 200k order was put in at 80.5c and it closed the gap to 84c. Then another order for 300k was put in at 82-83c I can't remember and share price jumped to 86.5c. I suspect the orders were just placed to encourage buyers to take out sell orders above.

Later on in the day, the two orders were pulled and the price returned to 78c.

Have only observed the market depth for two days maybe someone can suggest whether there is anything fishy?