Actually had a friend who reported a somewhat similar experience on salvia. I watched him hit the pipe, giggle for a minute or so before his expression went stone cold. After he came down it took a while for him to get his bearings. Asked him what happened and he said he felt like he floated into the sky and landed on a giant clock face. He heard a voice tell him that he would be stuck on that clock forever, and said it felt like literal years that he was there. Said he wouldn't do salvia again for a million dollars after that.

I on the other hand always had really delightful trips on it, so your mileage may vary from a five minute wacky giggle trip to eternity on the sky clock.