I'm surprised it's at .0050 and not in the high .0049s. Either way, I think Farah is correct. There is some thing happening at this .0049-.0051 price. Conversion or something of sorts.
I also agree that VNDM is facilitating this. I think once VNDMs activity on L2 either changes from typical 10,000 share bids or disappears then the process is complete.