Permanent Vision on Aurelion Sol [GAMEPLAY]

Dear Community,

While me and my friend Lady Andalea were enjoying trashing the enemy duo in botlane, we were surprised to see the enemy Aurelion Sol blissfully gliding across the map. Although we had no vision on him, we could see his character model's location in game, and on the minimap. The fog of war was still present around him, but we had permanent vision on his model. This ended when we went into combat with him. We are unsure if this is the reason our vision on him ended, and we also don't know what started the bug.

I have two screenshots of the image which can be seen here, http://imgur.com/a/h3CY5

Love, Dr Tumple