Secrets of Navis Nobilite can't be resolved peacefully. Bug?

[Animeous]

Felek agreed to let Cassia go if she becomes my navigator.
Theobald wants me to take Cassia to my ship.

Why are my only options:
1. Felek is a true monster. Lets do away with him - together.
2. The last thing I need is a monster on my ship. Cassia shall remain here, and you shall serve as Navigator on my vessel while you still live.
3. I should bring Cassia to Felek as I promised.
4. [Attack] I am sick of this station. I am taking Cassia, and you and Felek shall suffer a less enviable fate!

Option 3 is an absolute bull. My agreement with Felek is to take Cassia away, which is also what Theobald wants!!! This should be a completely different dialogue option!

Is it a bug or intentionally bad design? I spent 2 hours scouring internet for different dialogue options and those are the only options available to me.

I might choose to kill Felek because Theobald makes you promise to take Cassia to some other planet but she immediately forgets that and joins you as a navigator anyway.

[Sotanaht]

Bad design. The only correct option is to fight Felek.

[Solomon Kane]

Because Felek lied to you, he is not going to let Cassia leave. He wants her dead.

[Animeous]

Originally posted by Sotanaht:

Bad design. The only correct option is to fight Felek.

Damn. Wasted my time. I even tried dropping the stone Felek gives you, hoping Cassia would not faint and agrees to come with me. Oh, well. Thanks for letting me know