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Shak is clearly stronger; here, two factors played a role: the opponent made mistakes, and Direal got lucky. In principle, with a bit of luck, she can defeat many. For example, the Cursed Wyverns landed favorably. The only thing I don't understand is why he didn't attack the Ballista but the Tent instead, since the Ballista is quite strong for Shak, while the Tent only heals or kills three times.