It looks like the Scotia offer at .52 cents a couple days ago was a failed attempt at a cross since it didn't show up yesterday and was completed today by Anonymous who I would guess is CIBC. The 100k and 200k offers at .56 and .57 were withdrawn shortly after the cross was completed suggesting they were indeed blocking the stock from going higher to complete this cross.

If everyone remembers CIBC put up 500k to buy at .50 to match the Scotia sell at .52 on Tuesday and then with drew the bid so my guess is they had a disagreement on price which today got completed because CIBC could see that ECU was definitely ready to move higher they would miss that block of stock to help cover their short or build their long position.