He waved Pita over. "You, Pita, will sit here, at the apex of the pentagram. Once you’re in position, it’s vital that you don’t interrupt the protective spell I’ll be casting or try to leave the circle. It’s best if you don’t try to move at all. Just close your eyes and concentrate on the spot on your arm where the spirit wrote its name. When you feel its presence, use the visualization techniques we talked about earlier, and form a clear image of Carla in your mind. Then picture the hell hound—a big black dog—and order the spirit to attack it. If it helps, you can speak the command out loud as well as in your mind. The spirit will be forced to obey you once it’s under your mental control."