With little time to spare before Mari attacked him, Ethan decided to take a calculated risk.
Ethan resolved to attempt freeing Maki from the Arachnomind Enthraller's control over her, but he knew it wouldn't be easy.
First, Ethan needed to locate the Arachnomind Enthraller on Maki's body and eliminate it. Second, he had to accomplish this before Mari could launch an attack, which added an extra layer of complexity to the situation.
There was also the possibility that Maki would resist and try to break free from his grasp if he took too long.
Taking too long meant that the perilous situation remained unchanged, and Ethan would still have to face two opponents bent on ending his life.
Ethan understood that the longer the fight dragged on, the more uncertain its outcome would become.
This was his foremost concern at the moment.