Sekiro Lady Butterfly glitch how to beat her easy, quickest way- Battre la dame papillon glitch

I don't know what really happened, but during the phase 2 of the boss, I could spam my shurikens, that made an easy kill and an easy boss ^^
Phase 1 0:24
Phase 2 2:05

Glitch at 2:25

Je sais pas trop ce qu'il s'est passé, mais j'ai pu spam mes shurikens et la tuer facilement !

Glitch ?

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