I haven't read any translations (other than Professor Stevens) that may be out there, but in the original account only your #1 and #4 are clearly correct. According to Shioda Sensei, O'Sensei disappeared and then reappeared behind everyone and did the whole thing twice.
The point of my original post was not to rehash any arguments that probably occured on other threads, just to make clear the source of the stories so that they be judged rightly.
I, personally, highly doubt the stories. Everyone who has posted here apparently does as well. I just can't figure out why Shioda Sensei would either distort things or make them up.