Take immediate and decisive action if you detect the warning signs of an unexpected, uncomfortable, or uncommanded change in your aircraft to avoid loss of control. When a helicopter unintentionally departs from controlled flight, this can escalate into dangerous situations like unanticipated yaw, vortex ring state, or a low-G condition.
Watch this video to learn how to recognize and recover from an undesired aircraft state: https://bit.ly/ushst025