Thace is giving the trail mix a dubious look when Catra speaks. He doesn't jump in surprise, but the tension in his neck and arms subtly increases. When he looks up, it's deliberate, and his expression is carefully mild. The particular way he picks up the next item, which happens to be the toothbrush, is a clue that Catra might not be the only one newly clawless.

"The utility may not truly be intended for us." Thace sniffs the toothpaste next, with possibly exaggerated care. At least if it's truly the mundane item it claims to be and not, say, poison or drugged.