They see via connections to the optical nerve or know by other means. Spot those who don't want the Needle to move. The trap is created by you and them just now in present time. Do it if it helps. Compared to the trouble of having to do this all the time.
Entities wake up when they see they can cause physical action, such as needle motion.
They are not used to cause anything. Just as you who haven't been able to teleportate for a long time. A person who can't teleportate is in a terribly low state. Well, joking, although not entirely. If you could suddenly move a physical object by Thought alone you would probably wake up very fast from your human state.