Alephee had managed to attack the second array eye all by herself while fighting off with the runic chains. She also didn't let Kavach and Hath Oda escape unscathed.
With her unpredictable lightning, fire, and time element attacks, she had almost killed the two rankers. Both the members of Tumko's team were in grave danger of dying. They had missing limbs and cauterized injuries as their medals for surviving Alephee's attacks.
And this was when she wasn't really trying to kill the two rankers. Eren had told them to be easy on Tumko's team.
Eren had a wild thought of killing Tumko right here and robbing him of his Ability with his bloodline powers. However, he knew that Tumko's Ability was so unique that only he could bring out its true potential. The Mentalist class was the furthest away from him. Thus, the Ability that focused so much on his class wasn't going to be of any use to him.