Argos in the Palace

I assume I am getting close to the end of the game, but am having a bit of a problem on the Palace. I have been doing the game with henchies and not having any problems. I recently got to the Palace and am attempting to complete the mission, I was having some problems with the first room, the dang Shiroku(sp?) elementalists seem to cause me undo worry.

So, go back to Captain Sei and take a look at which NPCs are most helpful for that room. So, I select Argos, go back to the mission and than find that good ol' brother Mhenlo, Cynn (my other NPC choice), and Master Togo all get stuck on the area that Argos knocks down (I want that spell by the way, Destroy Terrain, 25E, 5C, 60S, causes exhaustion ). They just stand there afterwards and don't follow me. Has this happened to anyone else?

I never encountered this problem. Though my NPC choices were Talon and Danika.