Forum:What happens when the stunning spell blocks the killing curse?

I was wondering about something said at https://www.google.com/url?sa=t&source=web&rct=j&ei=O4v_VOWuOo_lsATX9oDAAQ&url=http://harrypotter.wikia.com/wiki/Killing_Curse&ved=0CB8QFjAA&usg=AFQjCNEGNgEE7M5OoVyZfMgI_cD7J0FQlw&sig2=-b1NyPJgaXKB2Fb5aPbWfQ. It said that when the killing curse is blocked with the stunning spell the two spells explode on each other. What does this mean? It would be much appreciated for an answer because I've been wondering for a while.ProtonusKiller13 (talk) 00:29, March 11, 2015 (UTC)