I have to acknoweldge being something of a conspiracy theorist :-)  While that sounds negative, and that I'm sporting a tinfoil hat....consider that criminal conspiracy is the most commony laid charge in the US courts. And conspiracies don't even have to be criminal....Anyone who's planned a surprise birthday party has conspired with others to deceive the birthday boy or girl. 

Seeing that it was one house (RBC in this case) handling all the trades on the buy side going into the closing Bell....it might not be some, but it could be just one investor/trader...One individual saying "just keep buying and grab everything available up to $2.09" and they were able to get 5,900 shares.  Certainly not a big position in of itself, but maybe its one person adding to an existing position.  

The more I think of it the more I think it could be Hart's "walk up".....I've bought a couple thousand shares at a time before, and I didn't see that kind of walk up with lots of few hundred each at ever escalating prices.  

Hmmmmmmm?  Time to put RVX "in play".....one can hope.