Aki remained silent while Andrew and Fluffy talked. It wasn't like she could hear them as they were talking in their heads, but she was calm now because she knew that Andrew was using a unique ability.
Unique abilities weren't very common, but they weren't rare either. It is said that 1 in 1,000 people have one and for a world with a population even larger than the Earth from where Andrew came, that could not be considered few.
The unique abilities could be very varied, that's why Aki believed Andrew when he told her that he was investigating the red dagger with his ability, since there were unique abilities of the encyclopedia or even analysis type, she thought that Andrew had an ability of that type.
While she was thinking that, Andrew asked Fluffy, "Now I understand your explanation better, but in that order of ideas, wouldn't a weapon with a conscience be difficult to use?"