From what I am reading and seeing in the videos, Zelena opens the portal for the Camelot people, and, after they leave, Zelena, Snow and Charming were sucked into the portal. It’s like…. there is some sort of force or entity in the Enchanted Forest that sucks them. Hook was there too, but apparently he somehow managed to stay in SB.
Dont forget they film out of order the scenes, meaning that the night scenes may happen in the episode the night before of the day scenes, meaning that if they all get suck into the portal, Hook may go too, bc in terms of episode this is the day after teh night scenes. And then the Regina and Emma scenes on the day may be them looking for the other 4.
What seems every odd is that everyone seems to be total fine with Henry not being in SB, being in NYC with some girl they dont know, and in a city where the Dark or the darkest also is. Also the Rumple scenes in NY he has a bag, maybe Belle send him away again, and he went to live in NY.
I didn’t say this takes place before the evening scene. I was talking about what is happening the Zelena portal scene happening in the door scene, and that Killian seemed to be the only one to avoid the portal.