If you are fighting someone who can detect hidden and you successfully shadow disappear, does combat still stop? Or is it like when a mob is slept during melee, and the next person's hit wakes it up?

My understanding is that combat still stops, but in a lot of cases, probably a person who sees you can re-initiate combat before you can move again if they want to.

Oh, I thought all the lag was on the front end, like owaza. Is that not the case?

1 round before, 1 round after.

Bard Repertoire Clarifications:
http://forums.carrionfields.com/dc/dcboard.php?az=show_mesg&forum=6&topic_id=23735&mesg_id=23735&page=

Okay, last question. What if you're fighting an aggro mob that detects hidden and you succeed? Does it immediately attack you again? Assume normal aggro, not greet_prog.

I can't think of any reason why it wouldn't.