Your post is nothing but conjecture. Three things to consider........
First is that it the junior markets have been terrible for months and now that JDN has shown signs of life and there is volume someone may be using this opportunity to raise cash.....doesn't mean they know anything.
Second is that it is the last day of the month.......possibly the owner needed to raise cash to balance their accounts.
Third and more interestingly.......maybe they are just selling to make a market and they will be back on the bid next week.