He bristles a little at the implication of his grandfather being anything like Snoke. Even if he understands why she'd felt that, when all she'd noticed was the sheer darkness in either... there is no comparison, not in Kylo's mind. Vader's aura may be cold, but he's treated his grandson with more warmth than Kylo had ever expected.

But what she says further draws him from that thought. She hadn't wanted him to fight on his own. That's touching, in its own way.

His brows knit as he tries to make sense of it all, and as his memories go back to that moment on the Supremacy, when they had been so intensely unified for a moment before it had all promptly fallen apart. "You left," he eventually says. Not accusation, but confusion. She hadn't left him with Snoke, no. But she'd left him alone, on a burning ship, to deal with the rest of the First Order entirely on his own to deal with the mess left in Snoke's absence.