I imagine that the ones you don't take to Moonrise are turned into Mindflayers in the interim. As soon as you check in on the camp, the ones remaining just spontaneously turn, just like the people on the nautiloid. Giving us a good fight, a deadly reminder of the risks of not finding a cure, and ensuring the other residents of the camp don't get killed. If fighting mind flayers at this stage is too tough then they just leave. Talking to other NPC's at the camp they explain that they got a weird look in their eyes and just left without warning or notice. They return later in the game as minibosses, completely controlled by the Cult of the Absolute. Either as themselves just as enemy NPCs or as Mindflayers.
Enjoying having a walking nuke formerly known as Gale in your headquarters Octopus brains!
I and my team of morally ambiguous adventurers of me Human Wizard, Astarion, Lae'zel, and Shadowheart shall mourn our lost companions in our hearts.

Last edited by TheAscendent; 03/07/21 11:07 PM.

Evil always finds a way.