Concentrate. A small bead of sweat trickled down Thorrissia's furrowed brow. Her eyebrows were knitted into a focussed scowl and her pearly white teeth were bared in a concentrated grimace of frustration at the amount of effort it was taking to balance upside down from a tree. The young brunette had hooked her feet under a thick protective branch, locking them into place so she wouldn't fall, but the strain of hanging there with her full body weight was starting to take its toll on her. The youn