当直升机到达操控者的正前方时，机体刚好成为倒飞后退飞行，继续执行侧滚的动作，等到直升机通过操控者的正前方以后，机身便恢复为正飞后退飞行。
The helicopter should be flying inverted and backward as it passes in front of the pilot, the helicopter should continue to roll back to upright after is passes in front of the pilot.
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