A helmet on the ground behind a motorcycle does not necessarily indicate that the rider is in distress. There could be various reasons why a helmet is on the ground, such as the rider accidentally dropping it, placing it there temporarily, or it being knocked off by external factors like wind or movement of the motorcycle.
While it's possible that a fallen helmet could indicate a problem, it is not a definitive sign of distress. Other contextual factors, such as the presence of the rider, their behavior, or any visible signs of distress, would be more reliable indicators of a potential issue.
If you encounter a situation where a helmet is on the ground behind a motorcycle and you are concerned about the rider's safety, it's always a good idea to investigate further or notify the appropriate authorities if necessary.