Ok here's a way to pvp enable the opposite faction if you want. Click on the person you want to enable, then type /duel. While you're dueling type /concede or /forfeit right before they hit you and they'll be pvp enabled and you can kill them.
"WoW Gamer Shares the Secret Tactics You Can Use to Legally Make up to 200 Gold per Hour or More in World of Warcraft Without Using Hacks and Without Getting Banned... So You Never Have to Buy Gold Again!" - Golds Secrets
