Whether it contributed to the crash in the last 24 hrs or it was pure coincidence, who knows. What I do know is I don't believe in coincidence 
It makes sense that they would short BTC, then switch to mBTC, make stupid people panic.
They could either went short on BTC or bought it cheap 2 hours later.
It's very possible that the mBTC switch was a scam attack.
Bitcoinity.com/Markets has a giant "DON'T PANIC" image on their page. Gox, Bitstamp, and BTC-e (the websites you'd need to go through to panic sell your Bitcoin) still price in Bitcoin, so the notion that somebody would not realize something is up is a bit silly.
What website do you believe caused mass chaos?