The classical comparison that comes to mind is this: LSD is like walking through the doors of perception. DMT (as in ayahuasca) is like being shot out of a cannon. I wonder if it has dawned on any of these "shamans" that a fistful of risperidone might be useful for the freakouts? Antipsychotics exist for a reason. Also, anyone on MAOIs is likely to have a very bad time, and people on SSRIs may not notice a thing (oth…
The shamans who are trained in the jungle and work with this stuff uses a variety of methods to work with those kinds of episodes. These are not fun, and they aren't really safe either. Some of the groups in the US are not trained or equipped to deal with it, and the more responsible ones will refuse to let someone drink if there are prior cases of psychotic breaks.
I do remember in one ceremony, one of the persons there went off on a journey. This was a group I don't usually participate with. To me, it wasn't unusual for someone to go into an episode like that. I've seen it happen in others and in myself. (And granted, I have heard of those who go somewhere and never come back but I have not seen it directly myself).
What was unusual in that case was that there no separate room set aside. Usually, the energies being whipped out of a person like that is intense enough to start inducing things in other people. What it usually induces is fear (fear of the unknown). As people started to get more and more uncomfortable, their own consciousness transmits feelings of judgement and censure ... which does not help the situation.
Ayahuasca is tricky like that. She'll allow situations like that to arise, and see if you're going to be mindful of things; or to facilitate an empathy exercise where you feel what it is like to be on the other side of those judgements. Freakouts like that can happen to anyone -- and likely, the more rigid, the more closed-minded, the more judgemental you are, the more likely it will be your turn next.