Ah. I found a good example of what I'm looking for in order to just clear up timeline stuff to let players know what happened when.
While talking to Kagha, Rath says, "Thank you, Kagha! Master Halsin would..."
Kagha replies, "Halsin isn't here. Keep his name off your tongue, lest Teela pierce it."
So, why not add the following: "lest Teela pierce it. He's abandoned us, Rath, and for what? He didn't even give us an explanation. He's been gone for over a month, and those adventurers have returned without him. He's dead. It's just us now. We must be strong and move on. Stop clinging to the false hope that he'll return. I will have no more talk of Halsin. As far as I'm concerned, he's a traitor to us all." Then she spins on her heel and storms off.
Boom. Simple addition to the dialogue now tells us several things rather quickly and seemlessly. 1. Halsin's been gone for over a month. 2. Kagha feels betrayed by him, like he abandoned them. 3. She is totally clueless as to why he left.