1 & 2 .) ok, sorry about the pause. This jutsu doesnt require seals, its' put into effect simply by sending yopur chakra to disrupt the opponent's chakra flow. they will not be hindered in any way until the earth chords constrict them. Their perception will be altered, but they can still perform jutsu until you bind them with the chords, and you have two turns to do so. If your two turns go by the effects wear off completely.
3.) it only counts as one of your jutsu during it's original posting. just like chakra sensory and hidden mist jutsu, one use with more than one turn of activity.