Viper's call doesn't work for me

Hello, i don’t understand, i’m playing druid with swarblade form, the node “viper’s call” which activate serpent strike as using armblade doesn’t work for me.
Any explanation?
I can use serpent strike while i’m not in swarmblade form. And after just the skill armblade working but without bonus of serpent strike tree…

Ok it’s my bad, just understand after 2hour that i took “locust master”…

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