$2.2ml pre opening os trade, trig stop losses?

Hi,
I don't own PVE stocks but Fridays PVE trading got my curiosity.

I am not sure how, but could there somehow be a correlation between the fact that (going by the Commsec daily trades) there were 2 separate overseas crossing (XTOS) trades of 944,673 trades / $1,100,544.05 each pre market opening at 08.57.30am Sydney time?

Another consideration: is it possible that once the first low trades started it simply started firing stop losses / limit orders, which in turn simply continued to trigger the next stop losses down the line one after the other in sequence?
OBJ did something similar a couple of weeks back - dropped from 4.1c to 3.5c (firing 6 stop loss threshholds) then back up to 4.1c in the space of less than 1 minute. Pretty sure it wasn't panic selling,just stop losses being hit.

Sorry, I am new to the market and I can't fathom the logistics to Fridays PVE trading.