First axioma of preserving capital. It is possible to gain a lot, however, the stock could fall endless till zero. So, if you try, set a strict stop-loss end get out when the stop is hit.
You REALLY think the stock will fall to ZERO??? Some people.....
Sentiment: Strong Buy
It's knife. Sorry, I'm no native!
The Wall Street has developed a new trading strategy: "catching falling knife". That is when blood is on the street and no one is going to buy, they step in.