Something was definitely up. Though you couldn't understand Dosh, you were pretty sure the Trandoshan had simply repeated what he'd said before, but there was no way these things would get along on a planet like this without at least understanding Basic. And it was doubtful that whatever he'd said before still was a valid response to what you had spoken.
Not only that, but something just felt wrong. The Trandoshans were still standing with their clawed hands behind their heads, but you noticed that while the larger, armoured one was looking you in the faceplate and responding, the other one's eyes were darting around past you and then to the guns on the ground.