I'll call it a bug, but perhaps it is just an unintended consequence.
When riding a seahorse, changing in to spirit form makes movement impossible. While I eventually figured out from reading these forums that I could get out of spirit form by pressing a number on the keyboard, I think there should be another way.
Perhaps pressing right-click while still over Naija's body should take you out of spirit form?
The main reason I think it is important that there be another way, is that up to that point, the keyboard is optional, and there is nothing to indicate its necessity there.