I remember, at the announcement time price dropped from 660$ to 620$, in a moment of craziness.
Then it bounced a bit but kept falling down to sub-550$. Then it recovered to 630$. After the auction ended,
it collapsed down to 500$, culminating in that 'flash crash' to 450$.
Having said this, i don't think these events are relevant per-se. But they are used by market makers to justify
big movements, and that is what i'm waiting for...