These phantoms were going to serve as Jason's elite spies and assassins. Jason wasn't a fool, and he knew that there were things out there that he just didn't have any control over. There were people and organizations that were making plans for him, and if he didn't gain more information about them, then he was going to be caught unaware when they finally made a move. So Jason was going to become proactive.
The Phantoms would dive into the shadows, and from there, they would follow anyone that Jason suspected of being dangerous. Jason knew that there were people who would be able to sense the Phantoms even if they were in the shadows, but that was only if the Phantoms got too close. As long as they maintained their distance, then no one would ever find out.
"You'll go into the shadow and stay there until I give you more orders. Alpha, remain here."
