Quote from diligent:
typically, for bust and adjust type situations like this, a "marketable order" is considered within 10% of last print for liquid stocks over $5.
doesnt island and arca have public erroneous-order policys?
yes they do. pretty much everything more than 3% away is in question. and you never know when trade can be reversed. i know few people,who been burned very badly over those erroneous trades