Whatever is protecting Whoop can't see into the Antispace, or follow him there. It's just Whoop and Parasite there. And Whoop doesn't have powers right now, meaning he's weak. He can easily be teleported back again if he manages to leave. And leaving is kinda hard to do when you're trapped in place.
whoop is now in the antispace, which is basically a place outside of reality. You can't get there normally, or LEAVE normally. Whoop is trapped there until PARASITE lets him leave. Also PARASITE has temporarily given Crown the powers needed to follow him there. Crown can follow him or just stay where he is.
