If you don't see the media, it's ok. It's just a pic of 11 year old Harry at the feast talking to Percy and grown up Harry talking to Albus Severus.

So think of the first and last thing Harry says about Snape. And then put them together.

1st thing: Say Percy, who is that teacher talking to Professor Quirrell?

Last thing: The bravest man I've ever known.

Case closed.

I hope I've managed to reduce you Snape fans to tears now.