WMF - I have ended up in an R22 on its side in a field myself due to a last minute unexpected control input from a 'student' at the end of a flare recovery to the hover.
It was poor instruction on my part, not bad luck, and I have never fought shy of admitting that - acknowledging where you have f&&&ed up is a step on the road to becoming a better instructor.
If inexperienced instructors aren't capable of retaining control of the aircraft on trial lessons, then perhaps they shouldn't be doing them.
And you'll probably tell me this is the harsh reality of civilian flying instruction and that I was just fortunate to have put myself through the beasting that was Military Flying Training in the 80s as I didn't have to pay for it myself.