When you are adding skill points, you can redistribute existing skill points in the Medic and Psionic skills by pressing the left button to remove them. For example: Sapphire comes with 2 existing Medic skill points, which you can take away and place in another category. However, if the skill points are placed in the other categories then it will stay there permanently.
Throwing Grenades
When throwing grenades, be sure to be at least six spaces away from the center of the blast. If you are not, you will take a sizable amount of damage, and be wide open to be finished off.