Nice. Looks a bit like, in an alternate reality, Red Riding Hood actually died and came back as undead, and is now out to hunt down the big bad wolf (In this case, Worgen. It is WoW after all). Must be the red hood, hahah.
Actually she serves to Forsaken, Horde is a temporary ally.
He was quoting the dialogue from the game :O
Garrosh Hellscream says: What difference is there between you and the Lich King now?
Lady Sylvanas Windrunner says: Isn't it obvious, Warchief? I serve the Horde.
Sylvanas mockingly salutes Garrosh.
Garrosh Hellscream says: Watch your clever mouth, bitch.