Umbra agreed with the skeletal figure's assessment of the situation. When he disintegrated the section of wall, Umbra ignored the others, and headed straight for it. After being imprisoned for so long, he was desperate for any sort of mental stimulation. He knew that he was not the hardiest of beings, but he could surely survive encountering prison guards. He would allow the others to follow along behind at their leisure. Then, once they were free, he would be fine with arranging some sort of marching order, to allow the hardiest of them to take the lead, and allow the casters such as himself to follow in safety. Besides, he wasn't entirely helpless, and his fear powers should be able to clear the area of enemies. Paladins could pose a problem, but he had his own ways of affecting even those. And their fear was the most delicious of all.