BONGANI GOLDEN MALEVU
They were tied because it was a common cause that if there is an accident they might get injured, so for their safety we have to tie them.
	When the car went to do the operation, found the young boys who had to guard these people.  They said to them, untie them, because you are armed and they are also cooperating, there is no need to tie them.
	Therefore after the operation, when they come back, they found they were tied.  They were only tied when they were caught and put into the car, but most of the time, they were untied.