First of all, what was described is not churning. Churning is when a broker does unauthorized trades in a clients account for the sole purpose of generating commissions for the broker.
Second, people who sells 300k shares in one print are not taking a quick profit. A stock that averages 180k shares a day does not make a flipper want to flip 300k shares in one print.
And seeing as how USPR is now offered at .142 after knocking out the 160k share bid, means there was more stock for sale then there was to buy.
Somebody wants out and they have a lot of stock, is what I am saying.