According to @EmberCN, during the rapid drop the trader closed 2,000 ETH just above a $4,668 liquidation price, lowering the liquidation threshold by $10 to $4,658. Source: @EmberCN. The position was opened with $740,000 in margin, still holds 23,100 ETH, has an estimated notional value of about $108 million, and shows $2.63 million in unrealized profit. Source: @EmberCN. Based on these figures, the implied notional-to-margin ratio is approximately 146:1, and the cited liquidation reference levels for this position are $4,668 and $4,658. Source: @EmberCN.