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From what I understand, Arteru is the user channeling the force to buff their own self beyond their normal capabilities and limits, strength, reaction, speed, power, etc.

But juyo does the same, it also channels the force to massiely bfuf ones own self.

whats the difference?

And why does it say juyo in particular is vulnerable to force attacks?

Because w/ Juyo, the focus is so much on attacking and killing the opponent that the user is left vulnerable. And the difference is that w/ Juyo, the user is channeling their passion, aggression, anger, rage, etc into the attack. Only the most skilled Jedi are able to do this without falling to the darkside, as their emotions are contained within a mental forge, thereby preventing them from spilling out and controlling them as many Sith do. Controlled chaos.

so is Ateru, the same except it is channeling the force...emotionlessly?

Ateru's more focused on acrobatics, speed and frenetic movement rather than aggression.

Originally posted by Board Walker
so is Ateru, the same except it is channeling the force...emotionlessly? No, Ataru focuses on spins, flips, and other acrobatic maneuvers. This is why Yoda primarily uses Ataru, because it allows him to overcome the restrictions that his height and reach would otherwise give him. Juyo (as well as Vaapad) use more direct movements that seem to be random and unconnected but are in fact well thought out. Just read about it on Wookiepedia or Fightsaber.

http://starwars.wikia.com/wiki/Form_VII:_Juyo_/_Vaapad

http://www.starwars.com/games/videogames/news20080728.html

http://img32.imageshack.us/img32/2803/jedivssith0134.th.jpg