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Частный trader Ilya Korovin, managed by proxy the accounts of other individuals, during the Asian session 5 May 2017 of the year received a margin call from a broker Saxo Bank, selling oil options.
According to Korovin, in this situation it was broker, did not allow significant drawdowns on the account and creditors, whom he allegedly warned about the strict requirements of the risk managers of Saxo Bank. but your oversight, as a trader, he never admitted.
https://market-lab.org/news/trejder-rasskazal-o-tom-kak-poluchil-marzhin-koll-ot-saxo-bank-na-aziatskom-shipe-nefti-
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Just, recently, on facebook, I warned about what happens with this style of trading: