Erwin
Erwin stared at the man, and he stared at everyone else, "Do no one else see that this man is a spy? He is heading towards hostile area's that either give a side a declaration of war, or is illegal and gives more right for those around us to declare war? Our traders may have free stakes, but, this man is smuggling goods to either a warlike people, or people that hate us and want a reason to declare war."
He looked at Jaz, and moved closer towards her, "The man, is travelling in the middle of the night when horses should be resting, he is several miles from a town we passed, which means he was likely waiting for us. I came over here to confirm it, and I just did because while he answered the questions, his reasoning would still go against the realm and it's laws of safety he is doing something illegal and punishable by almost every court in these lands and that reckless endangerment of the realm through allowing a provocation of war. There are always three questions you ask, who are you and do you have the authority to do such a thing, what goods do you have, and where are you going. He is going to pass through an area where his wares are illegal or through an area that is a warzone that likely wants to invade this land. Would you let that happen if you were me? Would you let that happen to your home that you want to do everything to protect?"
With that, and with the man now on his cart and in a nice elevated sight picture, he slowly placed his hand upon the trigger, "If you have any reason for me not to do this, tell me right in the next five seconds while I aim." If no answer was given or if nothing got in his way, he would fire for the man's back.