Well, characters act different around each other depending on who you have in your party in SoA. Keldorn and Viconia quite literally hate each other and either one leaves the party or they both kill each other. I'm not too sure on which mod it is, but I believe it's the
Ease-of-Use that keeps characters from leaving or killing each other, or I could be wrong. But if that isn't it, you'll have to boot Keldorn to keep your medic.
Later