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Filling the wooden barrel took longer than what Shin had expected. He didn't expect that the traps set up by Grandmaster Benn were that troublesome.
They were not just adjusting according to his speed, but they were also responding according to his movements. At first, Shin was able to take advantage of the flaws that he noticed from the formation. But the more he advanced, the lesser the flaws he could see – it was as if the traps were growing alongside him.
What's more, he also needed to climb back on the mountain top to bring the wooden bucket filled with water. Dodging the traps was one thing, but doing it while carrying a pair of water-filled buckets was another matter.
It was because he also needed to make sure that he would not spill the water while dodging the traps. And due to that, his movements became too limited.