Peter's eyes had locked back on Sylar's, but Claire's enraged shout wasn't lost on him. "Nathan," he said again, glaring into the eyes of his brother's murderer as he did so. "My brother."
The ball of electricity in his hand grew for an instant before winking out completely. Peter extended his other hand to reach for Claire, his eyes unmoving from the glare he was holding on the man.
"You have thirty seconds," he said. His tone was murderous, unwavering. "After that, if you are still touching Claire, you will lose whatever limbs are facilitating that contact. If I don't like what you're saying, I will kill you. Do you understand me?"