I saw the same thing happen to SWIM after drinking Caapi Ayahuasca. It was my third time drinking and his fourth, we drank 200g of Caapi and 300mg spice dissolved in orange juice each. I am aware this is a very high dose, we worked our way up to it and it seemed like the appropriate dose at the time. The last coherent thing he said about 30 mins after drinking was "I'm cold" and he looked pale. Shortly after he was unresponsive and thrashing around, his legs moving like he was walking but he was sitting in a chair. I thought it may have been a seizure or convulsions at the time, but after 20 minutes I started to realize it was just the Ayahuasca really taking hold of him. I was very scarred for him during that first 20 minutes. I was loaded myself and there was no way could I have driven for help if I needed to, and we were in the mountains miles down unmarked dirt roads, so I couldn't have called for help either.
I knew no one had ever died from Ayahuasca, but in the back of my mind I was thinking it could have been a completely separate medical condition that just so happened to occur at the same time. It lasted for about 40 minutes and he was able to communicate another hour later. He didn't remember anything, just a confusing unfocused trip. After some research I found that this is a common occurrence with larger doses and the only thing you can do is make sure that the person does not hurt themselves.
I knew no one had ever died from Ayahuasca, but in the back of my mind I was thinking it could have been a completely separate medical condition that just so happened to occur at the same time. It lasted for about 40 minutes and he was able to communicate another hour later. He didn't remember anything, just a confusing unfocused trip. After some research I found that this is a common occurrence with larger doses and the only thing you can do is make sure that the person does not hurt themselves.