im lucky to say ive never had this happen, although i can imagine what he was feeling like
i hit it sitting at a desk once in front of a computer and my hands and arms started turning into the same plastic as the keyboard, i couldnt move them and violently ripped my hands away in horror and they shattered into a trillion plastic pieces. luckily my friend was there to coach me and he talked me into being calm, and i just ended the 2 minute trip talking in a loop about being stuck, lol
my friend then proceeded to smoke some and his eyes locked onto a patch of dirty carpet, he started getting sucked into the carpet like quick sand. i was watching him and all he was doing was standing there barely moving his feet back and forth and kinda halfway being nervous but he said he was completely terrified and thought his legs were completely encased in mud and he was drowning in mud. lol
ive done it about 3 times, nothing like that happened again, it was mostly like everything infinitely expanding before your eyes or being in a tunnel. one time it was like being in a carnival house of mirrors and i could even hear some evil carnival music, and got stuck laughing for 3 mins.
/end blabbering, my point is
id bet 20 bucks that guy thought the couch was trying to suck him in / he was becoming part of the couch. the girl got locked into her mind / a loop, but was actually pretty level headed at the end.
when she said "no, stay inside, i feel like you need to be right here" and had him chill by the couch, that was actually exactly what needed to be said, its a shame she got locked to the couch though, that glass coulda shattered and came down in a sheet and severed his head clean off