Normally, Stik can only detach his head. So Blue wanted to help him experience full modularity by borrowing his body. Unfortunately Stik can’t swap heads and control other bodies like Blue can, so a solution was devised.
Using a series of sensors on Stiks body, he can essentially use his body as a remote to control Blues. So while it isn’t exactly swapping, it can mimic the effect.

Now Stik can try out being fully modular. Blue would have to be reduced to just a head but he doesn’t mind as long as his friends are having a good time ☺️