I was just curious. Do correct me if i'm wrong on this:

During the meeting with Shielyn, Yukiri, Leane, and Seanie were somehow transparent because they were using the copied dream ter'angreal. However, during the fight, Leane was chosen to remain and fight the Black sisters. I believe during the fight Leane used the OP to fight.

Now, iirc, during Nyn's fight with Moggy. She said that if she's using a copy ter'angreal, she can barely channel at all.

Assuming this is the case, how come Nyn, Siuan, or even the Black sisters use the OP during their fight? The BS used the OP to fight, and iirc, those were Sleepweavers. They are not meant to let any channeler enter WoD completely.

One other thing I've noticed as well, when Saerin (Nyn) reported that they were attacked by BS, several of them were quite strong. Who could they be?

Thoughts pls.