They should made it like shackles, spend an active follower for a deco object is not worth with the follower limitations. And beware if you enter the cage there is now way out ontly removing it. I wonder if an active follower in the cage will go out to attack when aggroed something, or if in pvp anyone will be able to enter the cage and got trapped. It could be fun, but im sure that if was possible FC made it by mistake lol

edit: you can exit it by pressing interact key, i was trying the traditional methods, roll or simple walk out.