An employee was using a tractor tug to move equipment. The employee dismounted the tug to hook up a bobtail cargo truck. When he was between the tug and the cargo truck, the tug shifter popped out of neutral, allowing the tug to run into and pin the employee, causing deep lacerations to both of his shins. He was hospitalized. The tug was running, and the shifter was not all the way in neutral at the time of the incident.