Can't Heal or Buff them, don't think any spells work on them except offensive
spells (DD, DOT, Debuff, etc). Kill guards can be fun (glad I don't have a
quest that requires me to go inside of Neriak as that's one of my favorite
hunting grounds for pp and exp). Training of guards on other players is a
bannable offense on several servers (on other servers you must explain that you
are training guards to protect your home- in essence "role playing" your race).
If someone trains, tell them to stop- if they continue, /petition or /report. I
made a really good friend after a training incident- DE enchanter who trained us
turned out to be a really nice (although ignorant at the time) person.

Ailamil Faithbringer