Yes the man does carry himself like he has not a care in the world about his situation, nor does it look like he has the pointed ears of an elf and Tevinter Slavers would think twice about capturing a man who looks as if he could be the one running the place. Armed or not, that wouldn't stop Fenris, but he does think twice about his situation.

He isn't here to make enemies around every corner. Especially if there is a chance they might be friends of Isabela.

Folding his arms, distinctly unfriendly in the face of the more friendly other man. He lifts an eyebrow. "A strange way to treat guests, to divest them of their armour and weapons and replace them with rags."