Admittingly it took me the second time. Meaning I saw it the second time and because seeing the movie for the second time out of three times, I just realized that because I did go back to reading the book and understanding Snape during those times and at first when I saw it the first time, I was just like 'Oh maybe he's trying to tell Harry something like it's our secret' um, if that makes sense but then I saw it the second time and I'm like 'Oh right.' XD