I can tell my emotions apart from yours. [Especially since there are so many alien components to them. By now it's probably more that he remembers Porthos' emotions rather than feels them, but even that is somewhat unsettling when they're emotions you've never experienced before.]
There's no need for concern. [He's mostly frustrated anyway. By having to go through that feelingsdump, by this entire event, what it's done to Ciel...]