Khan didn't initially believe Francis. He had no respect for the man, but the fear radiated by his mana was undeniable. Francis' eyes were also wide open, highlighting how scared he was of the tall, spherical structure.
The time for questions ended at that realization. Khan turned to inspect the machine, but only confusion appeared when he reviewed what he knew of the Thilku.
Humankind didn't have proper enemies. Wars had happened in the past, and some battlefields like Ecoruta still existed, but they didn't take anything away from the current relative peace.
However, strange and tense relationships existed, especially with fellow colonizers. Things were even worse with species that could match humankind's prowess, and the Thilku were one of them.