Maybe they sensed that Silas was injured and the weakest of the group, the zombies kept bum rushing his side.
Warner moved to his partner's side and it was noticeable so much that a female zombie looking like it recently died.
Since it still retained long black hair and the dress that it was buried in wasn't tattered threw herself at Warner en route.
Fiona saw but she could not use her ring as the zombie wrapped herself tightly around Warner and since at this point Fiona had little to no control over the ring.
The situation was so intense and Fiona felt that in such close range she would end up killing them both if she used the ring to help save Warner's life.
Warner screamed when the zombie bit into his neck, Silas was weak but he hacked at the zombie trying to save Warner but the female zombie refused to let go of Warner.
Tiamat pushed Silas aside and plunged his dragon claw into the female Zombie's head.
