I was playing Pudge. Tried to save an ally Sand King so i hooked him in sandstorm. Hooked him successfully but the sandstorm's animation was in the hero's previous position. Will SK still be invisible near me until he moves?? Where will the enemies get damaged?Is it Near the current position of SK or the place of sandstorm's animation?
Yes, Sand King will remain invisible and will still be channeling Sandstorm until he moves. While the animation will stay in the original spot, enemies will only get damaged in Sand King's new location (where you hooked him to).
See the following video for reference:
The visual effect not moving to Sand King's new location is likely a bug that Valve hasn't gotten around to fixing yet.