This experience for me showed that he was really inexperienced when it comes to trading futures, but the truth is that, such a thing can happen to anyone in times when volatility is very high, when price runs become really high, it makes sure to liquidate both long and short position in a matter of seconds and minutes, most especially, if you open a position with a very high leverage.
From what you describe, your partner was probably successful in his first few trades and he became confident with his subsequent trades. I'm not saying your friend doesn't have trading skills, but maybe he lacks experience in dealing with market news. what was clear was that it destroyed the trading plan he had made.
especially if you open a trade with high leverage, you may hope to catch up on losses. but he may unknowingly have increased his risk of greater loss. even draining all his money.
tell him to stop and try DCA for Bitcoin. maybe he will know a little about how to make a profit.