I think he meant to sell (out of fear) when others greedy, and to buy (to get more for less money) when others fearful. Then maybe he gets a benefit of the difference.
Something like, but not exactly, short selling.
That's only my opinion.
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Yea, thats excactly what I meant too :)
check this post, it proves my logic:
https://steemit.com/cryptocurrency/@jerrybanfield/why-are-digital-currency-prices-dropping-time-to-buy-steem