If you're long on margin, the position will of course be closed when the stock price drops (and the value of the position (= stock price * number of stocks minu

If you're long on margin, the position will of course be closed when the stock price drops (and the value of the position (= stock price * number of stocks minus margin loan) approaches zero), not when it rises. And it was impossible on RH and other brokers to buy more shares, selling (liquidating a long position) was always possible, AFAIK.