What is it - A Special Passive you get when you learn instant transmission
How it works - Remeber when you hold f it goes up to 15 then you knock your opponent back then if you release f you hit them again then when you press f you fly to them. Well this gives you a 4th one.
Example - When i have instant transmission in skill bar
Hold f
Release f
Press f
press d
4th combo activated when you press d and you will teleport behind the enemy, and hit them. not doing knockback though.