You can see below that at 10:39:47 the buyer did not (as you suggested) place multiple BUY orders for 320,000 shares. They placed a single BUY order for 2,200,004 shares.
If the trade was an ASK instead of a BID, then yes... those 320,000 parcels would be someone BUYING in 4 x 320K bites (as you suggested).
Apologies if I have my wires crossed here, but how are you reading the 10:39:47am trade below?
