Those 2000 BTC worth that was reportedly short ETH just before the attack.
Now he gets the capitulation to $7 or $1, so he can cash out BTC.
And assuming he was highly leveraged on the shorts, when he covers that will probably be the bottom. He might even go long ETH if it overshoots to the bottom side and he wants to profit off any bounce.
Also others who probably went short on the initial deadcat bounce after the flash crash to $13.
But remember don't buy until there is blood in the streets. It must get very bloody and many must panic before it is a nobrainer buy.
I didn't know about this short business, now this is starting to feel like an inside job. Surely the SEC/FBI will investigate the person(s) responsible for placing the order, if this were an SEC regulated asset that would be a no brainier.
Griff Green mentioned that there are only 500 people capable of this attack, i.e. the broad Ethereum dev community. The message also suggests someone who believed his hack was not stealing because it followed the principles of the code.
The ironic thing is the attacker could have likely keep doing small versions of this without causing the price to tanker. Makes me think it was someone who wanted to make a statement rather than a simple criminal.