Force Persuasion. (u are given it on that level) if persuasion doesn't work, try force sight.
I hope i helped, i also had trouble with that part, and decided to climb a tree to see if i can get over the barrier...trust me the barrier is impossible to 'climb over' without persuation.
Battle is a pure form of expression. It is heart and discipline, reduced to movement and motion. In battle, the words are swept away, giving way to actions-- mercy, sacrifice, anger, fear. These are pure moments of expression.