The thirty-three daggers had arranged themselves, forming a defensive formation between Cain and the Living Volcano's leg. Just because they were weapons didn't mean they couldn't serve as a shield.
Cain regained control shortly after, and with a wave of his hand, the daggers dispersed and rose into the sky. His eyes glowed red as the Ego Wave enhanced the daggers.
The Living Volcano sensed something amiss with the daggers, but having already encountered them, it deemed them non-lethal and lunged at the audacious human confronting it.
A cultivator would have recognized the danger of the daggers and monitored them closely. However, Cain wasn't facing a cultivator but a beast. No matter how powerful or wise Wave Beasts became as a result of their cultivation base, most remained slaves to their instincts and fierce nature, which is why they couldn't surpass any of the main six races of Aether.