How I got authorised to teach Ashtanga Yoga

Picture the scene: I've just done somewhere between eight and ten backbends and I stand up to try some unassisted dropbacks. I conquer the fear once and manage to get to the floor, from where I try, unsuccessfully, to stand back up. No dice.I get to my feet again and attempt to drop back again. As I'm preparing myself Sharath comes and stands in front of me (about 6 inches in front of me actually!). I go back and my hands touch the floor again. He doesn't help me. I walk in a little bit and Sharath puts his hands on my thighs. I stand up with ease, unsure of how it happened.He says "you can do it". I'm not so sure.He helps me to do three of those half-bend drop back thingys and then brings me all the way down (I walk in again) and back up.I'm physically and mentally drained and, as usual, a little shell-shocked by the back-bending experience.Sharath says, "You come to the office later and fill out the authorisation form. Actually, come tomorrow, I won't be there today".I say "ok". Which is all I can manage if I'm honest.Then I get into the pascimattanasana position on the floor and he presses me down hard. I say "uuugggh". After 3 breaths he's gone and I'm thinking, "....."And that's the story of how I got authorised!