Since I've played through Myst 4 I've come to the conclusion that I'm not sure what really transpired while "I" was uncouncious in Tomahna in the first part of the game. From various flashbacks I know that someone (presumably Sirrus) chased Yeesha into the fireplace of Tomahna, where she then closed the hatch and fled into Haven. I know she was in Haven due to the flashback in the nara chamber where she trips. Close to the chamber in Haven there is a crystal yielding a flashback showing that Sirrus and Achenar fought each other. There is also some dirt in Tomahna that yields a flashback where you can hear Yeesha pleading iirc about some key to a door leading to a linking book for Serenia.
I don't think I've gotten enough information to piece together what exacly transpired during my "nap". There are some leaps I've had to make for the story to make sense. Here's what I think happened:
* = logical leap (I'm guessing here)
- Sirrus discovers the frequency to destroy Nara.
- Sirrus breaks free and links to Tomahna.
- Sirrus attacks me with a sonic bomb and knocks me unconcious. *
- Sirrus goes after Yeesha.
- Yeesha flees into the fireplace and into Haven.
- Yeesha somehow gets through the bars or the object space in the Nara chamber of Haven. *
- Sirrus destroys the Nara chamber with a sonic bomb and goes after Yeesha. *
- Achenar finds Yeesha and Sirrus close to the chamber and goes to help her. *
- Sirrus and Achenar fight each other. Sirrus somehow wins.
- Sirrus drags Yeesha back into Tomahna and forces her to show him the way to Serenia.
- I wake up and start exploring.
- Achenar wakes up and goes to Tomahna and then to Serenia. (How does he know they went to Serenia?)
Am I close?