Purple is the colour indicator of movement abilities in usage.

Here I have considered functionality and visual of the teleport ability.

If you hold the ability key, you are able to aim your landing location. You can control the height and distance covered by moving your mouse in the aiming mode. Once the ability key is released, you will land at the indicated location. You obviously can't teleport right into enemies.

If the ability key is tapped, rather than pressed, the player will land right behind the nearest enemy, facing them to help their lead up into an attack.

When the player teleports, they will become momentarily "Dazed" (vulnerable) for around 2 seconds before being able to attack again.