What he did know was this: something about the situation smelled wrong.
If the children smelled wrong to their protector forefathers, they were killed.
But he knew one was wrong because he smelled wrong.
So far, I didn't smell anything wrong, except my shirt.
It was more that she could smell him as a male, and he smelled utterly wrong.
They smelled utterly wrong and the hair on her neck rose.
You said it yourself-anyone not from Earth would smell wrong.
But his sympathy is not real, because the poor man simply cannot smell anything wrong himself.
Humans will smell wrong; this is established as important to kzinti.
Most alarming, though, was that the people smelled wrong.