The icy command had him look first at Voldemort and then at Potter. He could not understand why he felt the need to confirm an order from the Dark Lord with a teenager. When the boy started to open his mouth, the Dark Lord interrupted, "You will not contradict me on this! If he has indeed been working for Dumbledore to protect you, I do not trust a single thing he carries. I only allowed the potion because he obviously would never hurt you. Tonight, I will let him stay by your side if that is what you wish. But I won't give him a chance to deceive us again."