Lolwut? The Forsaken are under Marshall Law... Garrosh's Kor'Kron elites are now policing the entire Undercity because he doesn't trust Sylvanas. Her hands are tied. She has no interest in helping Garrosh; she wants to be unleashed so she can become the "Lich Queen: (aka do more undead experiments and resurrections). She may try to help Vol'jin but I doubt that she would be able to with her people under such armed guard.