Really? How does that "bring to mind the perennial question?"
I thought this aircraft had a pilot in it.
RV, if the AS350 had operating RPM the pilot should have brought it to a hover. For some reason the pilot did not do this. It would have been a non event. If the RPM was low you have to ride it out.
We are assuming pilots can hover, mechanics cannot. However I have seen mechs who can hover better then me.
The "perennial" question; should mechs do full RPM run ups or not. I say overall no. It is too easy to get it airborne accidentally or otherwise. Ground idle only or at least tied down so hard ground resonance cannot occur.