he sold "puts" which is basically saying that he predicted that the stock price would go down and he was reserving the right to sell the stock at a higher price then it fell.
lets say stock A has a price of $25 right now. I think the stock price is going to go down
if I sell a put to you then i am telling you that i get to sell you stock A at some lower price in the future, lets say $20.
Scenario 1: You Win
When the date on the put contract comes up if the price is above $20 (lets say $29) I am SOL because I agreed to sell you a bunch of shares of Stock A for $20 so now i have to buy a bunch of shares on the market for $29 and sell them to you for $20 which you could then turn around and sell for $29 basically making $9 a share.
Scenario 2: I Win
The date comes by and the stock has crashed and now its only worth $10 dollars. You have agreed to buy my "put" which means I get to sell you the shares at $20, so I would go on the market, buy a bunch of shares for $10 and then sell them to you for $20 and then you are stuck paying $20 for shares that are only worth $10. I made $10 a share.
does this make sense?