Indeed, Ravus may say he doesn't know, but Ignis is kind enough to not call him out on it. He can't say he understands the feelings completely just yet. All he can say is that... He knows that one day - sooner than later, to the ache of his heart - his hometown will fall, and he will be left adrift.

Ravus has been left adrift for much longer than he. If he can even have this small bit of debris to cling to...

"You needn't worry about our host," Ignis reassures him. While this may have been a crime of convenience in some ways - mostly that it was convenient for him to get Ardyn alone - Ignis is always thinking. He's also had a lot of training and done his own personal research. This means, with all the time he had to hunt down bandits, kill Ardyn, and then start digging a grave, well... He's thought of a decent enough explanation for this.

It's also a complete lie.

With that in mind, he looks over Ravus. "I will be the one to pass along the news of Ardyn's death. I think I may be better suited for it, truth be told." Ravus doesn't seem as though he's built for telling falsehoods. "Why don't you go back to my home, and I will see you there? I can fix us some tea to thank you for coming to look for me, and help with the funeral preparations."