Whilst i can't help you with the scripting problem.
Im not sure under what circumstance every one, would drag the injured to a central medic location. As opposed to the medic moving to the injured. Generally moving someone who is injured isn't a good idea they would just move them to safety. The medic would then treat them on site.
If they are fine, they would continue on if they are need more treatement they are going to be evaced out, which the game dosn't really support.
If you're in some sort of fortification, a hospital/medical station might be set up which the injured would move to.
I like the idea though, a medic behind the line of a big assult or flying in to treat someone.