trying to figure out how the one impersonating Daniel could possibly take off his glasses...

Froonium.

Thanks for the fic pointer! Jack being sinister is really one of the best uses of dark humor to be sophisticated and accessible and *funny*. I did love Teal'c calmly reasoning with Lobster!Janet to let him out of the restraints, listening to her rational explanation for things and then quite seriously lying about knowing where Sam was. Fantastic.