Maybe you haven't seen the Dugar's "Letter of Intent for Investment in Bioamber, Inc." where he mentions he looks forward to "consummating the transactions contemplated hereunder."
Per PWC, this letter from Dugar forms "part hereof" the Offer.
Flippers gonna flip and toss the stock around while it trades to "prove" it won't be cancelled (until it is). Still have at least a month to play and do that before the music stops.