Hello,
I cannot believe the company are suggesting he/she conduct interviews, with no prior coaching or at least a list of questions to help him / her figure out what they are going to say, maintain consistency between interviews etc.
Has your friend actually asked them directly to give him / her some pre-interview guidance ? .. if not, they should and press for some assitance.
On closing, your friend should offer each candidiate the opportunity to ask their own questions (anything your friend doesn't know the answer to, just refer to the HR person in the room).
Also, your friend should know what the steps in the recruitment process are and when the candidate should expect to get an update on how the interview has gone (ensure everyone gets feedback by the way, even if it's a decline ... don't just ignore them, as it's very disrespectful).
..... Don't make any small talk.
I disagree with that Purple.
By all means use common sense and don't go asking silly questions ... but equally, you want to put both yourself and the interview candidate at ease, so a little small talk helps at the beginning and end of the interview, imho. Just keep it simple - sport is an old reliable, or social / community events which may be taking place.
Also, remember - you are proposing to hire a person that could be working with you for the next 20 years, so it is important to see if you are both compatible, or if the candidate seems like someone who would fit in, within the organisation at large.