What does it exactly feel like to supervise someone?

My ESI friend tells me he doesn't feel like supervising a SLE we know, so socionics isn't that right afterall. Seems ESIs don't believe in socionics very much. They trust their own lense more than theory.
I also have not felt like supervising IEI. So my question is how does being supervisor exactly feel like, from your own experience or observations. I think the supervisee feels the supervision more than the supervisor, because my friend I think does feel like being supervised by IEE quite often.