[Gameplay] Kalista-W (sentinel) reveals map for enemies

I recently found that when playing against Kalista, her W reveals a small part of the map for her enemies. It doesn't reveal champions, but if a ranged attack goes through the area that the sentinel is over, Kalista's enemies can see the ranged attack. I found this because no one knew where the other support and ADC were, and we noticed Kalista's auto-attacks at dragon.

This is hard to reproduce and can only be reproduced effectively in a custom game. However, with players on different teams:

1. Have Kalista launch her sentinel and then attack something with the sentinel in between them
2. The other team should be able to see the spears and the direction they are travelling

This allows the enemy team to have a good general idea of where kalista or any other ranged champ is. I have not tried this with other ranged champs, I only know that Kalista's spears can be seen.