To execute an Escape Posture (meongeppaegi), start in Horseriding Stance, raise both shoulders and bring both elbows upward to the side, raising the open hands up to chest level with the palms facing downward in front of the chest. The fingertips should point at each other. This movement is intended to break free of a grip (it's not an attack). The final position looks a bit like a Double Elbow Strike except with open hands, and the fact that the upper arms "rose upward" to break a grip rather than "moving outward" to strike at targets.
The Escape Posture appears, for example, in the form Palgwae Pal Jang