Darks&Lights are not allowed to go in the opposite safe barrier. If you see that happen take Screenshot and sent in a ticket soon.
You can sent ticket here
Have a good day.
technically seeing as both factions can go into this curtain its a safe barrier for both 'darks&lights'
Many times in the old days when i have been farming/grinding over at turtles in jungle and have been ambushed by some fury, i have high tailed it over to the oi portal and safety! Same as fury being chased 1/2 way accross the map can go to light oi portal so they dont die.
no attacking moves can be made by either faction if they are inside the oi barrier. pity this is the only place its used, it would be quite useful in other areas of the game
EDIT: oh and there are no guards at either of the curtains, unlike the curtains protecting spawn points. Obviously it was the intention of the Devs that either faction could use these 'safe zones'