Math already explained how it works and how it is that Aurora is vulnerable to it, all that remains to be seen is whwther Aurora's hash power is sufficiently greater than that of the attacker. If that is not what Math said please do translate what he was trying to explain, as it seemed a pretty clear explanation.
-MarkM-
Before writing my description for this. I want BCX to either publicly deny or accept the challenge. I know his only option is that he won't be able to do this. But I want him to write this. If he accepts. He should publicly state that he will invalidate the blockchain. He should do it from either genesis block (I will double my wager to 100 AUR or BTC equivalent today) or from block 5400 whichever is easier for him.