I believe he's asking if the casting animation locks your server position into place like a Jump does. For instance, you're running out of an AOE and you decide to lob a spear behind you (because fuck that guy) and on your screen, your character appears to continue moving throughout the animation, and you clearly make it out of the circle before it disappears... and then , just as your landing back on your feet from throwing your spear, several yalms away from the edge of the circle, it disappears... and then you get hit with whatever you were trying to dodge, and probably die because you had Blood for Blood on and you're a squishy ass DPS.