Arrows in fort battle are made with the colors red and green.
Red arrows are show in case of movemente or attempt to take a player's position.
In case of green, it's a swap with the other player.
the problem is when both players are really close to each other. It's really hard to see it.
Worst to daltonic people that can't see either when is far away.
This script just change the colors of arrow from red to black and green to white.