Lol what logic is needed? 2 people together see a red car right in front of them its a red car. 2 people on dmt together both see Shiva and its the brain fucking with you cuz science. Lol wtf? I mean I could understand 2 different visions or maybe even the 2 seeing entirely different beings and that could be seen as the brain doing something funny but there have been people experiencing the exact same "vision" at the same time.
Why can't people just admit to being afraid of the unknown instead of writing the stuff off completely? Even if you didn't believe in anything wouldn't life be more enjoyable being more open to possibilities?
Seems to me that people are pretty susceptible to suggestions or implied imagery. If you do it frequently enough, how about doing it separately from each other and corroborating your visions? It's not really about being afraid of the unknown, it's more like, "what's likely in this scenario where we're taking drugs that have severe mind-altering effects."