Kira's scent was exposed to the werewolves after diving into the river to save Dylan. The water washed away the perfume masking his vampire scent.
The werewolves didn't waste time as they charged to Kira, knowing he was a vampire. But most of them didn't recognize the vampire king.
They came from a new generation of werewolves so they were clueless about the real power of the vampire before them.
Kira just remained standing in his spot, next to unconscious Dylan. He was also cautious, guarding him against the sneaky attack of the werewolves. He never knew if they were going to attack the person lying on the ground or they would just focus on him.
But it seemed that it was the latter. Running on all fours, the werewolves leaped at Kira, stretching their claws and showing their sharp teeth as they aimed for his head!
To kill a vampire, they must cut his head off or dig his heart out of his chest. The same thing applied to the werewolves.