Malek was reluctant to let Layla go, but at that moment, he could only relent. If the worst-case scenario happened, then he would have to do everything to assist Achim's side and repel Filren and his company's attack. Malek was confident he could do this under Noir's array formation.
Once the array formation's effect was over... well, Malek did not even want to think about it.
Malek's doubts were proven to have been irrelevant because Layla kept her word. As a matter of fact, she only activated the Soul mark inside Filren and his company's bodies that she subtly placed on them and restrained their movements.
