Something similar to Robert's experience was the first time I taught someone the Moving Form and gave them the initiation qi, I saw some mountains and flags with Chinese characters for a very brief time, a matter of seconds, although I could not recognize which particular characters they were.
When I used to do the Non-moving Form when driving my car (haven't driven in years now), I preferred not to do the counting, so I just recited the passwords and simultaneously did both visualizations of the sun and the moon rotating in opposite directions. I found it very relaxing. In my experience, PGSG is very flexible that way, and the Non-moving Form does things for me that the other two forms never did, especially in terms of real-time correction of qi blockages and similar problems. I feel specific problems being corrected while I was doing the form.
My speculation about Saber's experience is that what he relayed actually happened. I think Teacher Ou was talking directly to an aspect of those students' person, although I don't know exactly what to call that aspect. Their spirit, perhaps? Again I speculate, that it's a part of you that is most accessible during brain activity between waking and deep sleep when your brain waves are in the alpha state
. I think I have utilized that aspect of a person when doing qi healing, although I did not have any direct, verbal communication of any kind. Certainly makes me curious about getting training on how to do that.