Responses
Because Lucaon lowers his guard when he's with Kyon, which is something someone could take advantage of in order to hurt him. And that's exactly what happened: Kyon convinced Lucaon, who never eats actual food but energetic pills only, to eat food with him, and someone saw it and took the chance to slip a poison in Lucaon's meal.

What can kyon do to hurt him and why is he a danger to lucion