Ethan gave Harriet an incredulous look when she said the other two could defend themselves.
"Sure, you can join us. I don't think they'll have something against it." He watched through the window at this side. "You're wrong though, about them being able to defend themselves. They have no skills to do that. What can they do? Ben can see invisible things and Mike can leave a vulnerable body behind as he becomes one of those invisible things Ben can see." He sighed. "It'd be best for them to leave this agency. This isn't the right place for them."

While he didn't like that idea, he hated the idea of them getting hurt even more. And he couldn't be with them all the time to keep them out of harm's way. Not if he wanted to do the things he liked to do.