What to do with an traitor...

[Almeidaboo]

In Suikoden 1 you´ve got to decide whether to kill or not your enemies...Darc, in Arc of the Lad, forgives Delma which stabbed him in the back...Cloud forgives Caith Sigh...

REcently, a friend of mine left my Ragnarok Online Guild to join another one just because it´s strong and mine´s starting yet....thing is he doesn´t know nobody in that guild, it´s an international server...

If you were in my position, former Crimson Leader of the Drakengard Guild, what would you do?

EDIT: To prevent people to answer as lively as Darkfox, I was asking for a in-game punishment. So, be at ease, i won´t be in the news like  "F*ck-minded-Brazilian tears friend in pieces and eats his brains for game reasons"...
You can also tell experiences you´ve had, feel free to share

EDIT2: Post funny retaliations too!

[Darkfox]

Honestly it's just a game. A game and nothing more. Not a very creative game, but a game none-the-less.

[Osmose]

Hunt him down and kill him... many times. If it's possible steal all of his equipment too, and add him to your guild's kill on sight list. Lastly, make a bunch of stickers that say "Traitor to the guild" and put them all over his computer, backpack, etc.

[Almeidaboo]

LOL, nice one Osmose. I´ll put a price on his head...and the stickers, lol...i´ll notice the whole guild that he changed sex maybe hahahha...

[Darkfox]

Isn't that still excessive? Oh well... myswell put somthing up...

Put his keyboard in a submarine sandwhich and make him eat it saying it's a new kind thats extra crunchy!