I have defeated the Kraken (which was very easy), selected Zahua to stay behind and I let the eyeless return to abydos.

The hammer was soulbound to myself.

Some issues:

 

- Zahua survived by using the diving helmet. It was in my stash and he had something different equipped before and after the scene. Is this intended?

- The hammer is soulbound to me before and after the event. How could Zahua use it?

 

 

Hey Madscientist.

 

This is intended. In the SI, you "give" Zahua the hammer to destroy the crystal, otherwise, he wouldn't be able to do so. He made it back alive, so you could say, he gave it back to you. 

 

Thanks!