We should first admit that this is not the lowest in this bear market, so, why Buffett buy now? According to the market value strategy, he maybe right to buy now. But don't remember he is rich, he buy at a very low price with high interest rate, and also this is just his spare money, he can invest the money for a very very long time.
So, as a little citizen like us, we can't follow him, we can't afford the further falling of the market. I would suggest keep cash in this moment, and buy at another low, which may happen next year. Be patient, don't be sad for missing the chance in this short rise, the overall market is bad ... the world is becoming more 理性 in this era ... so, don't dream like last year ...
By the way, I see HSI will rise to 17000 or 19000 before the end of this year ...