After the chapter about Lidusis' past I was really afraid that it was actually him who killed the servant.
But it makes perfect sense that it wasn't him because he triggeres the demon kings power only when he's under great pressure...
(servant's death, Ibriel's death, Ishuella + Rood's short awakening as the Demon King when he thought that Kiel died)
Now Lidusis shouldn't be haunted by the past anymore - that would really be a step back in the story and his development.
So ironically the one who can probably endanger Lidusis the most is Rood...
But Rood said in this chapter the he's able to track Lidusis without problem - so something has changed.
I can't wait for the next chapter.