There's something weird about it though. Hive account@nijeah tried 4 operations, first a -1Vest withdrawal, then a -2Vest, then -10 Billion, and finally -1 Trillion, which is way over the Vesting Fund of 391,231,329,807 Vests.

Not to shamelessly plug my stuff but, I emphasize this very detail here: https://steemit.com/steem/@jerc33/steem-blockchain-down-here-s-what-happened

Also, and not less important. No one just tries stuff like this and at these disastrous amounts (albeit negative amounts, sure) on a production environment. This is a completely irresponsible conduct for someone "just testing the system".

EDIT: The right approach would be. trying this in a testing environment, of course. But still disregarding that one, at a -1Vest withdrawal Hive account@nijeah had already all the information he/she needed to report it to Hive account@steemit directly. And by doing so, the SteemitDevs would have 7 days to prepare and probably correct the error, instead of having to push all-nighters just because of the incompetence of a, presumably self-entitled "pen-tester".

I have a hard time believing this had other intents than malicious ones. Incompetence doesn't look like this.