Morro had successfully taken over Stiix. A town that's above the water. No way anyone would suspect ghosts to live there. So, there won't be any Ninja in sight to take the Green Ninja back.. whom Morro has kidnapped, and drained their energy by using their body as host most of the time.

"You can give up. Your friends won't ever find you here~ no one suspects a Ghost's lair to be above the water."

Morro spoke to the Green Ninja with a smirk on his face. As Ghosts die from water after all. And the Green Ninja is locked up in a cage.