For example, Ben deposit 2 BTC (BTC price: 50,000) on Larix and borrow 10,000 USDT, which trigger the liquidation process. Alice liquidated 0.1USDT of Ben‘s account, but 0.1 USDT is still less than 0.000001 BTC(smallest unit of BTC). Therefore, although Alice does liquidation for Ben’s account, so she cannot get Ben’s collateral.