Rumer, Demi and Demi's youngest daughter, Tallulah Willis, sat down together for an episode of Jada Pinkett Smith's "Red Table Talk" show, airing on Monday, November 4, in which they discussed the 2012 incident where 31-year-old Rumer watched her mum have a bad reaction to drugs and suffer a seizure at a party.
Opening up about the terrifying ordeal during their appearance on the Facebook Watch series, Rumer recalled: "I was there in the other room with 911 panicking because I'm like, either my mom is gonna die and I'm not gonna be in the room and I'm gonna feel the guilt of that for the rest of my life, or I'm gonna be there and see this image of my mom that I will never get out of my head.
"What will I do? Or I will have to call my sisters in the morning and tell them that my mom died and they are never gonna get to talk to her again," she continued.
"Ghost" star Demi recalls the health scare in her memoir Inside Out, where she writes: "I inhaled some nitrous. I smoked a little spice, which is like manmade pot. It's not like I went wild and overdosed."
"I just had a weird reaction, a seizure, which is apparently not that uncommon when people do nitrous or 'whip-its,' the DIY version of the laughing gas you get at the dentist's office... I scared Rumer so badly when she saw me there, semi-conscious on the floor; she thought I might die in front of her."
After the incident, Rumer, Tallulah, 25, and their 28-year-old sister Scout Willis cut ties with Demi and didn't speak to her for three years. However, they've since reconciled, and the daughter of Bruce Willis recently revealed she feels "privileged" to have read the memoir - as it introduced her to a different side of her mother.