Ice Triangle (아이스 트라이앵글, Aiseu Teulaiaeng-geul) is an advanced Lighthouse Flow Control technique created by Khun Aguero Agnis. He infused his Ice shinsu to "fortify" the flow control of the Lighthouses. By adding these freeze effect to the trapped target, the target now have to break two layer of defenses, which are the flow control itself and Khun's Ice shinsu.
This is a genius creation, since it will become much harder for the opponents to break free from Khun's Lighthouse Flow Control. This was proven when Khun was able to stop the movement of the Flying Launcher, a high speed flying object instantaneously, while normally this object is most likely very hard to catch for most Regulars, since most Regulars can't fly.