Lucifer saw the fingers begin to glow, and reacted by looking at Sam, and yanking a knife out of his hand. And then sawing Sylar's hand off in an impossibly, inhumanly strong motion.
"You don't get it." He threw him to the ground. "All the powers you steal, and you've just made this easier for me. I know how to kill you...but I won't."
He glowered cruelly at him, and jammed the point of the knife under his jaw. And began literally peeling the skin off his face. "I won't, because I can keep you going for a thousand years just. like. this. That?" A bloody gesture at Sam, before he viciously began flaying him again. "He's off limits. And if you ever threaten me or anything of mine again, I will leave you so broken you won't know how to stop pissing yourself."
Let me know if you need me to reword things; Lucifer's a godmod in canon so it's hard D:
"You don't get it." He threw him to the ground. "All the powers you steal, and you've just made this easier for me. I know how to kill you...but I won't."
He glowered cruelly at him, and jammed the point of the knife under his jaw. And began literally peeling the skin off his face. "I won't, because I can keep you going for a thousand years just. like. this. That?" A bloody gesture at Sam, before he viciously began flaying him again. "He's off limits. And if you ever threaten me or anything of mine again, I will leave you so broken you won't know how to stop pissing yourself."