Not quite the same, but my girl has gone into "sub-space" on at least two occasions when I've shared her with others. Once was with one additional guy, the other time was with another couple (with all three of us, myself, the other guy, and his wife) gangbanging her.
There are big chunks of time during both that she can't remember anything but remembers coming out of it "vibrating all over" (her words).
Both times included rough anal sex, which I think has a lot to do with it. When she's in submissive mode, she gets very euphoric so I can see this slipping into a kinda blackout reverie at its limits. 😈😍😈