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-The only way you are going to be hurt by this individual is if you worry yourself and think about it.  Nothing from the non-physical can hurt you unless you 1) want it to or 2) fear it.  You can always fight back and the best way is usually to ingnore it.

Hello Aussie lib
  There are articles in the magic section and in Robert Bruces articles on how to protect yourself. I also have a website www.astralhealer.com that has a few articles but most of them are also posted here on the Astral Pulse.
  If you have any further problems my address is nita@astralpulse.com
I suggest shielding of your friends and people the Father is trying to harm. I will be starting a class on this on the 26th of March.
   Nita

If this guy has issues in the Astral, he as issues in the physical.  Find a way to stop him in the physical.  Meanwhile try using chi barriers if you know how or protective spells (if you're not against it) Unless you can actually project, then it would be dificult or dangerous to confront him while he's in the astral(or physical for that matter).  Sorry I can't help you that much with that aspect.
But PM me if you have questions bout what i mentioned or if i can help