A child to a family of royalty, a younger son, likely someone who had flown underneath the radar, all things considered, Leiland probably did have at least some understanding of what things had been like for Percival, of what the situation would have added up to. And honestly... If his family had been forcibly taken from him, he likely would have ended up defending them just as fervently. After all, he had loved them despite what some people might assume. He had loved them. Perhaps too much, given the way that none of them could have given a damn about him when it all came down to it. And it was that love, that hope, that desperate desire to be appreciated, that had twisted his motives, that had pushed him to put his hard earned skills to use for Zaul'Nazh rather than continue to flounder in abject isolation and struggle with the constant lack of acknowledgment.
Granted, things hadn't improved a great deal since then. But at least their Lord offered him more consideration than his family had.
Which probably spoke more to his family's neglect than the Zaul'Nazh's kindness.
"I more than understand the gravity of what you've shown me, Percival. Your truth is safe with me," Leiland said, casting another glance around the entrance hall before turning his gaze back to their spymaster, quietly taking in the picture of him, without the shadows offering their concealment, before taking a step forward and settling a hand lightly on Percival's shoulder. "You should take the mask off more often."