It was the action of their broker increasing the margin requirements that caused the reversal. We haven't seen anything like that in Bitcoin (yet).
I totally agree with that. What I do find striking is the similarity between Bitcoin and gold, albeit on differing timescales.
It looks like Bitcoin in slow motion. The large bull runs in gold were driven by geopolitical events inducing a flight to perceived safety. Then when the price starts taking off the FOMO brings in a speculative frenzy that eventually fades away bringing a quick reversal. With Bitcoin the initial driver is different, increased exposure in the mainstream media, but what follows is very similar.