I've been with my current company for slightly over a year. I've never been reprimanded, written up, or heard any displeasure with my work. Yet a couple weeks ago, I started hearing rumors of my being let go. Now, I'm the sole person in my position. This company doesn't require more than one person for my department. This morning, I was told that I'd be interviewing a new person for my department. With the rumors going around, it is quite possible that this person is my replacement. The reason I'm doing it, is that no one else here really understands what I do(IT). Are there any protocol's that I should follow? If he is to replace me, I obviously don't want that, as I like my job. But I also don't want to put myself into a situation where I might get into trouble.
EDIT
Just to give an update. My boss had me do this interview for a friend of his at another company. That company doesn't have anyone with any programming experience, so they reached out to us to see if we could give the technical interview. Thanks for all of the answers.