...They saved my life upon my arrival on your planet. I am now indebted to repay the favor. If I do not, I will have disgraced my people entirely and will never be allowed home.

[Fun fact: Martians do not possess emotions. Really. They will insist to the end of their days that they have never felt a thing. So any sadness in Croach's tone? Totally imaginary.]

If you left now, I would not have to stop you. I implore you.