If you hit him 3 times each kneel as a 32 on normal, then he dies in two swords. AKA: 12 hits on normal
On hard, hitting him 15 times puts him just above enrage mode. Then, you hit him maybe 6-8 more times and he's dead. So about 22 hits on hard.
English
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On hard It's 15 to enrage and 18 to kill him I believe
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It's 18 R2s
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Hit him two or three more after enrage. 17 or 18 total