Somebody dumped 1+M shares before close - they are seriously trying to get out. They were initially placed as one large parcel, but were then split and only half was flogged in AC auction.
I hope that was some fund with stop loss reached so they must dispose the shares - if so, it will be still shark feeding time tomorrow. Another (less nice) option is that there's really something that they know and we don't (yet). My money is on #1 (buy).
BKN Price at posting:
$1.07 Sentiment: Buy Disclosure: Held