A small flash crash around 13:10 Beijing time on Aug. 22 caused sharp price wicks in Bitcoin, Ethereum and multiple altcoins, while oil and other non-crypto assets also experienced brief, violent volatility. Jiang Zhuoer, founder of the B.TOP mining pool, advised traders against holding large, highly leveraged altcoin long positions in a unified account. Under cross-margin arrangements, a sudden 50% collapse in one coin can leave the account under-margined and trigger the liquidation of other assets. He recommended isolated margin, which separates positions and limits the potential damage from an extreme move to the affected position, although the approach is less convenient.