I read a comic book. I will say a little preface. The villain immobilized his comrades. And the main character says, "that takes care of they (the enforcers in the comic book)". Isn't it necessary to use the future or continuous here? What is the reason for choosing Present Simple? I can not understand.
idiom: to take care of something, to handle it, to do what needs to be done.
Basically, when finishing up a task, you would or might say it: That takes care of that.
Here, he immobilizes them and says it. It is an idiomatic usage.
He could have been cooking dinner, washing his clothes in a washing machine or taking out the trash or programming a rocket to the moon. As one finishes a task, one often say: That [the action[ takes care of [the task]. And it usually means the task was not pleasant or was difficult or a pain in the tail.