Erlik's defeat had greatly affected the battlefield. The undead believed that without their leader, even if somehow they managed to kill the Titania and her Fae guards, it would be a hollow victory.
They were unaware of Gremlik's contingency plan and were expecting that the reinforcements from the other city-states would arrive shortly to finish them off. The moment one of Erlik's followers managed to disengage from their opponent, they Warped away with no care for their allies.
With the enemy side's number thinning and Kalla being able to devote her full attention to her minions, the Fae were quickly gaining the upper hand. Phloria stood guard at the Wight while Lith and Friya backstabbed one undead after the other.
They would have loved to help Leannan and kill Gremlik, but the Titania kept him too close to her for them to have a clear shot at the Grendel.