Undoubtedly, this potion must act in a way that will prevent me taking the Horcrux. It might paralyse me, cause me to forget what I am here for, create so much pain I am distracted, or render me incapable in some other way. This being the case, Harry, it will be your job to make sure I keep drinking, even if you have to tip the potion into my protesting mouth. You understand?