Which carry method allows for a free hand but is not recommended when behind someone?

The trail carry method is characterized by resting the firearm across the back of the shoulder with the muzzle pointed behind the shooter. This carry allows the user to have a free hand for other tasks or for balance while walking. However, it can pose a safety risk when behind another person, as the barrel is pointing toward them. If the firearm were to be inadvertently discharged, it would endanger those in front.

In contrast, the other carry methods either ensure that the firearm's muzzle is pointed in a safer direction or do not allow for a free hand. For instance, the sling carry keeps the firearm secure and typically points away from other people, minimizing risk, while the elbow carry and two-handed carry both require the shooter to always control the position of the firearm, further enhancing safety when in proximity to others.