Observer - Speed Control (속력 제어, Soglyeog Jeeo) is an advanced technique for the Scouts Position. This technique will allow the Scouts to control the speed of an object or living beings. This technique was first used by Ranker H-14 to slow down the Hell Train which traveled at a very high speed in order to get into the Last Station by force as quickly as possible to evade the blockade of Zahard's Army. H-14 require at least four Observers to slow down the train.
A similar technique was used by the Purple Eye Brothers, one of the many team of Regulars which sponsored by the Zahard's Army in the Battle of The Last Station. They are a two-man team who was sent to stand guard inside the Last Station. When the Purple Eye Brothers confronted Yeo Miseng, they use their Observer Purple Eye's special skill Slow Eye to "slow down" Miseng's movement who was running to attack into their direction. However, the Purple Brothers failed to stop Miseng when she used "Reflection" skill to deflected the attack.