Luka makes note of the switch, and readies one hand to flip it when necessarily. But he doesn't make the move to flip it just yet.

"I'm not the only one who's killed a... one of you, you know." He says. "Why do you reserve this resentment for me alone?"

His fingers are resting on the switch now, and he'll flip it if he hears movement before words. But he figures some dialogue might be worth an attempt, at least.