$Tesla(TSLA.US) is back to playing end-of-day high-frequency trading. With only 100k principal, the rest of the money has been deployed but not yet settled. If this 100k is wiped out, I'll deposit another 100k. If that's also lost, I'll conclude this strategy doesn't work, effectively saying goodbye to options, US stocks, and HK stocks. I'll wait until prices are extremely low to bottom-fish, buying regular shares without leverage for value investing.