Seeing that he is unlikely to catch the troll on foot, Faien turns and sprints for his mount. "Keep that up, Vaeri; if you can cause enough pain, it may turn to fight. Auran, stay with her; I will get my horse."

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And unless there's some sort of pathing advantage from the water walking, even Faien can't catch it; with his flaw, a 15ft speed boost and no armour only give him a normal person's speed. Double move to his horse instead; next turn, should be able to untie it, mount, and pursue.