Disrespect
Khan didn't expect an immediate answer, and Professor Parver didn't give one. The issue wasn't only about an experimental medical procedure. The eventual success would also transform the Professor into something suitable for his foreign mana, which would, in all likelihood, be inhumane.
Moreover, the delay was unavoidable. The Professor had yet to undergo multiple tests, and Garret had to study the necessary material to devise a viable procedure. Khan still couldn't solve Professor Parver's problem, so his answer could wait.
The wait featured more than battles in the arena and parties in the quadrant. Another crucial event had knocked on Khan's door, surprising him. He knew that moment would have arrived, but things had happened earlier than he had predicted.