Which dungeons are a no go for HC purposes when boosting someone?

How to prevent that the client dies due to being teleported on by mobs etc?

Stay away from the dungeons that have "Slay all enemies" and you will be safe.

Oh and Whispering also has a tough front entrance. Rest should be safe.

deserted underpass
Vault of the Forsaken
Sanguin

those 3 no good;

there are more however just not listed yet