interesting market depth - volume of bids

An interesting change when I checked the market depth a minute ago.

It's the first time in quite a while I've seen the sellers orders outnumbered by the bidders by a reasonable margin, for ABV at least.

Bid amounts aren't huge by any stretch of the imagination but the volume is out of the ordinary for this stock. I could postulate a few theories.

Personally I have no active orders. Any idea's on who the mystery bidder could be (Assuming it is one) ..... Bueler, Bueler .................????