I have all my briefs on Powerpoint - try it and you will find it far better than chalk and talk as long as it is done properly, you can do it in just the same way but without the distraction of having to turn away to write things up.
Powerpoint
Errmmmmm, HELP! A friend of mine has an interview soon at a certain top secret flying training organisation and has to give a stalling ground brief followed by a flying demonstration.
Simplicity, I say, is evidence of the most advanced form of teaching!
Some of the best briefs I have ever seen have been concise with a minimum of "aids".
I assume your friend is a qualified flight instructor in which case I would expect him to be able to brief stalling with little preparation since this is a basic exercise, although it is understandable that he wishes to be well prepared for a job interview.
Finally, I was once taught that the 5 stages of teaching were:-
1. Preparation
2. Presentation
3. STUDENT PARTICIPATION
4. Recapitulation
5. Post Flight Brief