It was stupid how nothing happened to Svidi after you completed Sibbi Black-Briars Misc. Quest, so this adds 5 assassins who start from Riften Jail and proceeds to the inn in Ivarstead if you rat out Svidi's location to Sibbi. However the fight (Thanks to the engine) will only start when you are in the same area as both parties so feel free to just pop in whenever you want.
Now it will be a fair fight as three guards will spawn to defend Svidi. Have fun watching the fight.
Now it will be a fair fight as three guards will spawn to defend Svidi. Have fun watching the fight.