Alexander adds in a low tone "I would tend to agree." Then, to the man, he speaks with a smile "Could you excuse us a moment? We would like to discuss this... after what has happened, you can see why we would want to be careful." He then ushers the party back a little ways so they can talk with a fair chance of not being heard, and looks at the other members. "I don't suppose any of you could discover his general weal, or whether or not he's trustworthy, could you? If he is, I would agree that we show him the item, as well as the rest of the magics we found, and discover if we can convince him to tell us more about them."
Alexander glances back at the man with a reassuring smile. "Pardon my rudeness, sir, but I don't beleive you've told us your name. Would you be so kind as to tell us who we have the pleasure of speaking with?"
EDIT: Spelling