I have seen this several times, as there are usually some small gaps in between a huge sell and then seeing some quick doji, but better to always make use of some indicators to make a safe move than a risky one all in the name of catching a quick falling price and thinking that would be the only saving grace, in a fast moving market when everyone is trying to dump, you may just end up screwing yourself up finding how to sell.
I remember how people were dumping on me last year when BTS was going to be delisted on bittrex without me knowing.