At the sound "dont go". its a hidden mission. You can help Thida and know her side story. Thida is the doll which missing the right arm who help us to tell the way. She is older sister of Ratri. You can free her soul when you turn back after you hear "dont go".
You say he isn't a gamer but he is probably one of a few people who almost passed the floaty head lady undetected first try. BTW, this new update is HARD. Monsters deal more damage, Ratri spawns in the first floor, holy cow! And หัวร้อน gaming is real lol
1:08:30 As she walked, there was that sound. That's the sound of a Thai dancer's anklet All Thai dancers must wear anklet because in the past Thai people believed that they would bring good luck ( for beauty is another reason why Thai dancers have to wear ankle bracelets )
Thai people believe that some kind of power will have some secret spell that you can order death body to do something for you. That the reason of all events in this episode.