Looks very similar to last fall...The NDX breaking down this week (in hindsight obviously) was a very good indication of how this rally had weakened...The Nikkei collapse last night was just icing on the cake...
OTOH, and it's been mentioned frequently, the "bear phase" can be a bitch to trade because it has a completely different structure to the bull phase...It's not at all uncommon for the spike rallies to completely retrace previous downswings before it retraces the move entirely once again...Same thing we saw on many days last Jan-Feb...