There seem to be some people asserting that there are versions of BIP91 being run that only accomplish the segwit activation portion of segwit2x and NYA and don't do anything regarding the 2x portion. I am in the midst of attempting to have such a conversation with ck, here: https://bitcointalksearch.org/topic/m.20212423
I execute trades every $50, and everything went pretty smooth with me, except for a mistake that I made at $1859. For some reason I sold twice at $1859, when I thought that I was executing buy orders.. I still cannot figure out what I did exactly, so in order to recover, I had set buy orders to buy back my mistake at $1840 and $1820, but alas, we never returned to those prices.. at least so far.
I did not buy back in yet, and like i mentioned, it is not a big deal to me because it only amounts to about .2% of my total BTC related holdings. I have certainly made much bigger mistakes, and I was also buying all the way down to $1800 (on some exchanges), so I am doing o.k. with the trading part.
Regarding how rapidly the price dropped, yes, I was surprised too. I had buy orders set down to $1500, but there were some places that I had not really thought it through to well and my orders were a bit scrambled up in the $2000 to $1500 arena.. because, like you, I did not think the price would go down that far and that fast, and I did have some more money that would have been prepared for below $1500 - but I would have been scrambling a bit with those funds too, if such an event would have occurred - so yep, I am feeling a bit better, now that the below $1800 and furthermore the below $1500 are looking less imminent - even though there could be scenarios in which we go back in that direction... but right now upwards seems to have quite a bit of decent pressure and volume and there even seems to be some fundamental reasons that this BIP91 signaling could end up facilitating some solid progress on the segwit front... .. it is like the market is starting to know that the stars are coming close to aligning (in the buy the rumor and sell the news context)
There are quite a few variables out there, and even when you are asserting to be "out of the loop", you seem to be able to identify some of the more important factors, which I find to be helpful... and at the same time, each of us knows that we have to take our internet feed back with some grains of salt... in attempting to figure out which characters might be more reliable than others in terms of providing decent perspective(s).