Quite a lot I've got out of this. First, BTC is something people buy when they are feeling good, not bad. People buy it as an insurance so if stocks tank so will BTC. Therefore it is no good safety net that some people view it as.
The next thing is that USD still has a lot of reserve currency status and as such it's a currency people run to in risk off. As such, anything learnt from people trading USDOLLAR can be applied to BTC. It would be nice to overlay a composite chart of BTC rather than BTCUSD with USDOLLAR index to confirm.