Nightwing raised an eyebrow at that and was immediately on guard. Surely X wouldn't be stupid enough to try to kill someone right in front of him; but, then again, Nightwing didn't really know enough about him to really make a judgement like that.
"Sure, you told him," he said, on his feet in an instant and ready to protect Cake if he needed to, "but you didn't tell him what it means apparently."